Philippe JEAN-PIERRE

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/08/2020
• Auteurs : Kostas DanisOlivier EpaulardThomas BénetAlexandre GaymardSéphora CampoyElisabeth Botelho-NeversMaude Bouscambert-DuchampGuillaume SpaccaferriFlorence AderAlexandra MaillesZoubida BoudalaaViolaine TolsmaJulien BerraSophie VauxEmmanuel ForestierCaroline LandelleErica FougereAlexandra ThabuisPhilippe BerthelotRaphael VeilDaniel Levy-BruhlChristian ChidiacBruno LinaBruno CoignardChristine SauraElise BrottetDelphine CasamattaYves GallienScarlett GeorgeDelphine ViriotFatima Ait BelghitiSibylle Bernard-StoecklinJean-Claude DesenclosCoralie GieseDidier GhislainMagali GounonNathalie GrangeretCécile MarieBruno MorelMuriel DeherAnne-Sophie Ronnaux BaronGeneviève CourbisNathalie RagozinMonika WolskaEric SerangeDelphine MercatelloSoraya AiouazMartine ValetteEmilie FrobertLaurence JossetVanessa EscuretFlorence MorfinGeneviève BillaudMyriam BlancJulie Arata-BardetMarie FroidureMarion Le MaréchalPatricia PaveseIsabelle PierreAgathe BeckerPierre ChauvelotAnne ConradTristan FerryPatrick MiailhesThomas PerpointCécile PouderouxSandrine RouxFlorent ValourMarie-France LutzAnne PouvaretVirginie VitratMylène MailletCécile JanssenEmilie PietAlexie BoschAnne-Laure DestremMargaux IsnardThibault Challan-BelvalChloe WackenheimAlice CouturierGael GhenoThierry RoupiozNicolas LucetStéphane AyouniMireille VincentServicio de EpidemiologíaDirección General de Salud Pública del Gover BalearVirginie Masserey SpicherCatherine BourquinJeanine StollPascal ChaudAnne-Laure Mounayar
• Organismes : Santé publique France - French National Public Health Agency [Saint-Maurice, France] Centre Hospitalier Universitaire [CHU Grenoble] Hôpital Edouard Herriot [CHU - HCL] Centre International de Recherche en Infectiologie Hospices Civils de Lyon Groupe Immunité des Muqueuses et Agents Pathogènes Laboratoire de Virologie [Lyon] Virpath-Grippe, de l'émergence au contrôle -- Virpath-Influenza, from emergence to control [CIRI] Santé publique France - French National Public Health Agency [Saint-Maurice, France] Hospices Civils de Lyon Santé publique France - French National Public Health Agency [Saint-Maurice, France] Centre Hospitalier Annecy-Genevois [Saint-Julien-en-Genevois] Santé publique France - French National Public Health Agency [Saint-Maurice, France] Centre Hospitalier Métropole Savoie [Chambéry] Techniques de l'Ingénierie Médicale et de la Complexité - Informatique, Mathématiques et Applications Grenoble - UMR 5525 Centre Hospitalier Universitaire [CHU Grenoble] Santé publique France - French National Public Health Agency [Saint-Maurice, France] Cellule d'intervention en région Auvergne-Rhône-Alpes Centre Hospitalier Universitaire de Saint-Etienne [CHU Saint-Etienne] Hôpital Bicêtre [AP-HP, Le Kremlin-Bicêtre] Santé publique France - French National Public Health Agency [Saint-Maurice, France]
• Publié dans Clinical Infectious Diseases le 30/10/2020

---

Résumé : Abstract Background On 7 February 2020, French Health authorities were informed of a confirmed case of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in an Englishman infected in Singapore who had recently stayed in a chalet in the French Alps. We conducted an investigation to identify secondary cases and interrupt transmission. Methods We defined as a confirmed case a person linked to the chalet with a positive reverse-transcription polymerase chain reaction sample for SARS-CoV-2. Results The index case stayed 4 days in the chalet with 10 English tourists and a family of 5 French residents; SARS-CoV-2 was detected in 5 individuals in France, 6 in England (including the index case), and 1 in Spain (overall attack rate in the chalet: 75%). One pediatric case, with picornavirus and influenza A coinfection, visited 3 different schools while symptomatic. One case was asymptomatic, with similar viral load as that of a symptomatic case. Seven days after the first cases were diagnosed, 1 tertiary case was detected in a symptomatic patient with from the chalet a positive endotracheal aspirate; all previous and concurrent nasopharyngeal specimens were negative. Additionally, 172 contacts were monitored; all contacts tested for SARS-CoV-2 (N = 73) were negative. Conclusions The occurrence in this cluster of 1 asymptomatic case with similar viral load as a symptomatic patient suggests transmission potential of asymptomatic individuals. The fact that an infected child did not transmit the disease despite close interactions within schools suggests potential different transmission dynamics in children. Finally, the dissociation between upper and lower respiratory tract results underscores the need for close monitoring of the clinical evolution of suspected cases of coronavirus disease 2019.

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/08/2020
• Auteurs : Ardalan SharifzadehganMarc LauransMarine ThuillotAndres HuertasPierre BaudinaudKumar NarayananMariana MirabelJean-Emmanuel BibaultPierre FreyVictor WaldmannEmilie VarletDenis AmetChristophe JuinThomas LavergneXavier JouvenPhilippe GiraudCatherine DurduxEloi Marijon
• Organismes : Hôpital Européen Georges Pompidou [APHP] Université Paris Cité Paris-Centre de Recherche Cardiovasculaire Hôpital Européen Georges Pompidou [APHP] Hôpital Européen Georges Pompidou [APHP] Université Paris Cité Paris-Centre de Recherche Cardiovasculaire Hôpital Européen Georges Pompidou [APHP] Hôpital Européen Georges Pompidou [APHP] Université Paris Cité Paris-Centre de Recherche Cardiovasculaire Université Paris Cité Paris-Centre de Recherche Cardiovasculaire Université Paris Cité Paris-Centre de Recherche Cardiovasculaire Hôpital Européen Georges Pompidou [APHP] Université Paris Cité Paris-Centre de Recherche Cardiovasculaire Hôpital Européen Georges Pompidou [APHP] Hôpital Européen Georges Pompidou [APHP] Université Paris Cité Paris-Centre de Recherche Cardiovasculaire Hôpital Européen Georges Pompidou [APHP] Hôpital Européen Georges Pompidou [APHP] Hôpital Européen Georges Pompidou [APHP] Hôpital Européen Georges Pompidou [APHP] Université Paris Cité Paris-Centre de Recherche Cardiovasculaire Hôpital Européen Georges Pompidou [APHP] Université Paris Cité Paris-Centre de Recherche Cardiovasculaire Université Paris Cité Paris-Centre de Recherche Cardiovasculaire Hôpital Européen Georges Pompidou [APHP] Université Paris Cité Paris-Centre de Recherche Cardiovasculaire Hôpital Européen Georges Pompidou [APHP] Hôpital Européen Georges Pompidou [APHP] Université Paris Cité Paris-Centre de Recherche Cardiovasculaire
• Publié dans American Journal of Cardiology le 22/10/2020

---

Fichiers liés : S0002914920304677.pdf

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/08/2020
• Auteurs : Kostas DanisOlivier EpaulardThomas BénetAlexandre GaymardSéphora CampoyElisabeth Botelho-NeversMaude Bouscambert-DuchampGuillaume SpaccaferriFlorence AderAlexandra MaillesZoubida BoudalaaViolaine TolsmaJulien BerraSophie VauxEmmanuel ForestierCaroline LandelleErica FougereAlexandra ThabuisPhilippe BerthelotRaphael VeilDaniel Levy-BruhlChristian ChidiacBruno LinaBruno CoignardChristine SauraElise BrottetDelphine CasamattaYves GallienScarlett GeorgeDelphine ViriotFatima Ait BelghitiSibylle Bernard-StoecklinJean-Claude DesenclosCoralie GieseDidier GhislainMagali GounonNathalie GrangeretCécile MarieBruno MorelMuriel DeherAnne-Sophie Ronnaux BaronGeneviève CourbisNathalie RagozinMonika WolskaEric SerangeDelphine MercatelloSoraya AiouazMartine ValetteEmilie FrobertLaurence JossetVanessa EscuretFlorence MorfinGeneviève BillaudMyriam BlancJulie Arata-BardetMarie FroidureMarion Le MaréchalPatricia PaveseIsabelle PierreAgathe BeckerPierre ChauvelotAnne ConradTristan FerryPatrick MiailhesThomas PerpointCécile PouderouxSandrine RouxFlorent ValourMarie-France LutzAnne PouvaretVirginie VitratMylène MailletCécile JanssenEmilie PietAlexie BoschAnne-Laure DestremMargaux IsnardThibault Challan-BelvalChloe WackenheimAlice CouturierGael GhenoThierry RoupiozNicolas LucetStéphane AyouniMireille VincentServicio de EpidemiologíaDirección General de Salud Pública del Gover BalearVirginie Masserey SpicherCatherine BourquinJeanine StollPascal ChaudAnne-Laure Mounayar
• Organismes : Service d'Infectiologie - Unité de gestion du risque infectieux [CHU Saint-Etienne] Physiopathologie et biothérapies des infections muqueuses [CIRI] Centre d'Investigation Clinique - Epidémiologie Clinique [CHU Saint-Etienne] Virology and human respiratory Pathologies - Virology and human respiratory Pathologies [CIRI] Centre International de Recherche en Infectiologie Université de Lyon
• Publié dans Clinical Infectious Diseases le 30/10/2020

---

Résumé : Abstract Background On 7 February 2020, French Health authorities were informed of a confirmed case of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in an Englishman infected in Singapore who had recently stayed in a chalet in the French Alps. We conducted an investigation to identify secondary cases and interrupt transmission. Methods We defined as a confirmed case a person linked to the chalet with a positive reverse-transcription polymerase chain reaction sample for SARS-CoV-2. Results The index case stayed 4 days in the chalet with 10 English tourists and a family of 5 French residents; SARS-CoV-2 was detected in 5 individuals in France, 6 in England (including the index case), and 1 in Spain (overall attack rate in the chalet: 75%). One pediatric case, with picornavirus and influenza A coinfection, visited 3 different schools while symptomatic. One case was asymptomatic, with similar viral load as that of a symptomatic case. Seven days after the first cases were diagnosed, 1 tertiary case was detected in a symptomatic patient with from the chalet a positive endotracheal aspirate; all previous and concurrent nasopharyngeal specimens were negative. Additionally, 172 contacts were monitored; all contacts tested for SARS-CoV-2 (N = 73) were negative. Conclusions The occurrence in this cluster of 1 asymptomatic case with similar viral load as a symptomatic patient suggests transmission potential of asymptomatic individuals. The fact that an infected child did not transmit the disease despite close interactions within schools suggests potential different transmission dynamics in children. Finally, the dissociation between upper and lower respiratory tract results underscores the need for close monitoring of the clinical evolution of suspected cases of coronavirus disease 2019.

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/08/2020
• Auteurs : François BenezitPaul LoubetFlorence GaltierCharlotte PronierNezha LenziZineb LesieurStéphane JouneauGisèle LagathuAnne-Sophie L’honneurVincent FoulongneChristine VallejoSophie AlainXavier DuvalNawal HouhouYolande CostaPhilippe VanhemsSélilah AmourFabrice CarratBruno LinaOdile LaunayPierre Tattevin
• Organismes : Service des maladies infectieuses et réanimation médicale [Rennes] = Infectious Disease and Intensive Care [Rennes] Université de Rennes F-CRIN, Innovative clinical research network in vaccinology (I-REIVAC) CIC Cochin Pasteur CIC Montpellier F-CRIN, Innovative clinical research network in vaccinology (I-REIVAC) Biocommunication en Cardio-Métabolique Centre Hospitalier Régional Universitaire [Montpellier] Centre Hospitalier Universitaire de Rennes [CHU Rennes] = Rennes University Hospital [Pontchaillou] Université de Rennes F-CRIN, Innovative clinical research network in vaccinology (I-REIVAC) CIC Cochin Pasteur F-CRIN, Innovative clinical research network in vaccinology (I-REIVAC) CIC Cochin Pasteur Centre d'Investigation Clinique [Rennes] Centre Hospitalier Universitaire de Rennes [CHU Rennes] = Rennes University Hospital [Pontchaillou] Université de Rennes Service de Virologie [CHU Cochin] Hôpital Saint Eloi [CHU Montpellier] Centre d'Investigation Clinique de Limoges Anti-infectieux : supports moléculaires des résistances et innovations thérapeutiques F-CRIN, Innovative clinical research network in vaccinology (I-REIVAC) CIC Hôpital Bichat Service de Virologie [CHU Bichat] F-CRIN, Innovative clinical research network in vaccinology (I-REIVAC) CIC Hôpital Bichat Service d'Hygiène, Epidémiologie et Prévention [Hôpital Edouard Herriot - HCL] Laboratoire des pathogènes émergents -- Emerging Pathogens Laboratory [CIRI] Service d'Hygiène, Epidémiologie et Prévention [Hôpital Edouard Herriot - HCL] Institut Pierre Louis d'Epidémiologie et de Santé Publique Institut des Agents Infectieux [Lyon] F-CRIN, Innovative clinical research network in vaccinology (I-REIVAC) Université Paris Cité Service des maladies infectieuses et réanimation médicale [Rennes] = Infectious Disease and Intensive Care [Rennes] Université de Rennes Centre d'Investigation Clinique [Rennes]
• Publié dans Infection le 27/10/2020

---

Résumé : Purpose - To describe the burden, and characteristics, of influenza-like illness (ILI) associated with non-influenza respiratory viruses (NIRV). Methods - We performed a prospective, multicenter, observational study of adults admitted with ILI during three influenza seasons (2012-2015). Patients were screened for picornavirus, respiratory syncytial virus (RSV), coronavirus, human metapneumovirus, adenovirus, bocavirus, parainfluenza virus, and influenza, by PCR on nasopharyngeal samples. We excluded patients coinfected with NIRV and influenza.Results - Among 1421 patients enrolled, influenza virus was detected in 535 (38%), and NIRV in 215 (15%), mostly picornavirus (n = 61), RSV (n = 53), coronavirus 229E (n = 48), and human metapneumovirus (n = 40). In-hospital mortality was 5% (NIRV), 4% (influenza), and 5% (no respiratory virus). As compared to influenza, NIRV were associated with age (median, 73 years vs. 68, P = 0.026), chronic respiratory diseases (53% vs. 45%, P = 0.034), cancer (14% vs. 9%, P = 0.029), and immunosuppressive drugs (21% vs. 14%, P = 0.028), and inversely associated with diabetes (18% vs. 25%, P = 0.038). On multivariable analysis, only chronic respiratory diseases (OR 1.5 [1.1-2.0], P = 0.008), and diabetes (OR 0.5 [0.4-0.8], P = 0.01) were associated with NIRV detection.Conclusions - NIRV are common in adults admitted with ILI during influenza seasons. Outcomes are similar in patients with NIRV, influenza, or no respiratory virus.

---

Fichiers liés : Benezit et al-2020-Non-influenza respiratory viruses in adult patients admitted.pdf

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/08/2020
• Auteurs : Aurore RaouxNoémie BauxJean-Philippe PezyPierre BalaySandric LesourdJean-Claude Dauvin
• Organismes : Morphodynamique Continentale et Côtière Morphodynamique Continentale et Côtière Institut national des sciences et techniques de la mer Laboratoire Universitaire des Sciences Appliquées de Cherbourg Morphodynamique Continentale et Côtière Cellule de Suivi du Littoral Normand Morphodynamique Continentale et Côtière Morphodynamique Continentale et Côtière
• Publié dans Ecological Indicators le 01/11/2020

---

Résumé : The impact of 70 years of dumping harbour dredged material on ecosystem functioning was compared to a control site (non-impacted zone). A combination of indices (Shannon-Wiener diversity, Pielou evenness, BO2A, AMBI benthic indices) and modelling (Ecopath models) generated Ecological Network Analysis indices were used to detect the dumping operations effects. ENA indices showed that dumping operations appear to have a relatively limited impact on the structure and flow pattern of the local food web. In fact, only small variations between the two sites are revealed by a comparison of ENA indices between the impacted and non-impacted zone. This result could be explained by the fact that the Bay of Seine is historically characterized by a high level of human activities, which have led to an increase in resilience through time to face these multiple pressures. AMBI and BO2A indices (of the sediment fauna) did not allow a clear distinction between impacted and nonimpacted zone while species richness, abundance, biomass and Shannon-Wiener diversity index values were significantly higher in the non-impacted zone which is in accordance with the small variations of ENA indices between the two zones and revealed a local and limited impact. Our results suggested that a combination of several tools should be used to detect the true impacts and to conduct diagnosis of the ecological status of dumping deposit in a coastal area permanently stressed under natural and anthropogenic forcing.

---

Fichiers liés : 1-s2.0-S1470160X20303186-am.pdf

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/08/2020
• Auteurs : Vladimir I KorobovJean-Philippe KarrMohammad HaidarZhen-Xiang Zhong
• Organismes : Bogoliubov Laboratory of Theoretical Physics [Dubna] Laboratoire Kastler Brossel Université d'Évry-Val-d'Essonne Laboratoire Kastler Brossel Wuhan Institute of Physics and Mathematics
• Publié dans Physical Review A le 29/10/2020

---

Résumé : A complete effective Hamiltonian for relativistic corrections at orders $m\alpha^6$ and $m\alpha^6(m/M)$ in a one-electron molecular system is derived from the NRQED Lagrangian. It includes spin-independent corrections to the energy levels and spin-spin scalar interactions contributing to the hyperfine splitting, both of which had been studied previously. In addition, corrections to electron spin-orbit and spin-spin tensor interactions are newly obtained. This allows improving the hyperfine structure theory in the hydrogen molecular ions. Improved values of the spin-orbit hyperfine coefficient are calculated for a few transitions of current experimental interest.

---

Fichiers liés : H2plus_a6_v3.pdf

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/08/2020
• Auteurs : Yazid BelkacemiNoemie GrellierSahar GhithKamel DebbiGabriele CoraggioAdda BounedjarRedouane SamlaliPauletta TsoutsouMahmut OzsahinMarie-Pierre ChauvetSedat TurkanHamouda BoussenAbraham KutenDusanka TesanovicHassan ErrihaniFarouk BennaKamel BouzidAhmed IdbaihKarima MokhtariLazar PopovicJean-Philippe SpanoJean-Pierre LotzAziz CherifHahn ToVladimir KovcinOliver ArsovskiSemir BeslijaRadan DzodicIvan MarkovicSuzana VasovicLiljana StamatovicDavorin RadosavljevicSinisa RadulovicDamir VrbanecSouha SahraouiNino VasevIgor StojkovskiMilan RisteskiSalvador Villà FreixaMarco KrengliNina RadosevicGiorgio MustacchiMladen FilipovicKhaldoun KerrouAlphonse TaghianVladimir TodorovicFady GearaJoseph Gligorov
• Organismes : Imagerie Moléculaire et Stratégies Théranostiques
• Publié dans European Journal of Cancer le 22/10/2020

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/08/2020
• Auteurs : Jean David Lau Hiu HoongJérôme LuxPierre-Yves MahieuxPhilippe TurcryAbdelkarim Aït-Mokhtar
• Organismes : Laboratoire des Sciences de l'Ingénieur pour l'Environnement - UMR 7356 Laboratoire des Sciences de l'Ingénieur pour l'Environnement - UMR 7356 Laboratoire des Sciences de l'Ingénieur pour l'Environnement - UMR 7356 Laboratoire des Sciences de l'Ingénieur pour l'Environnement - UMR 7356 Laboratoire des Sciences de l'Ingénieur pour l'Environnement - UMR 7356
• Publié dans Automation in Construction le 28/10/2020

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/08/2020
• Auteurs : Yves AllenbachCéline AnquetilAli ManouchehriOlivier BenvenisteOlivier LambotteBénédicte Lebrun-VignesJean-Philippe SpanoStéphane EderhyDavid KlatzmannMichelle RosenzwajgBruno FautrelJacques CadranelDouglas JohnsonJavid MoslehiJoe‐elie Salem
• Organismes : CHU Pitié-Salpêtrière [AP-HP] Institut de Myologie Centre de recherche en Myologie – U974 SU-INSERM CHU Pitié-Salpêtrière [AP-HP] Institut de Myologie Centre de recherche en Myologie – U974 SU-INSERM Vanderbilt University Medical Center [Nashville] CHU Pitié-Salpêtrière [AP-HP] Institut de Myologie Centre de recherche en Myologie – U974 SU-INSERM Hôpital Bicêtre [AP-HP, Le Kremlin-Bicêtre] Immunologie des Maladies Virales et Autoimmunes Centre d'investigation clinique Paris Est [CHU Pitié Salpêtrière] CHU Pitié-Salpêtrière [AP-HP] CHU Pitié-Salpêtrière [AP-HP] Sorbonne Université Sorbonne Université CHU Saint-Antoine [AP-HP] Immunologie - Immunopathologie - Immunothérapie [CHU Pitié Salpêtrière] Centre d'investigation clinique Biothérapie [CHU Pitié-Salpêtrière] Immunologie - Immunopathologie - Immunothérapie [CHU Pitié Salpêtrière] Centre d'investigation clinique Biothérapie [CHU Pitié-Salpêtrière] CHU Pitié-Salpêtrière [AP-HP] CHU Pitié-Salpêtrière [AP-HP] Institut Pierre Louis d'Epidémiologie et de Santé Publique Sorbonne Université CHU Tenon [AP-HP] Vanderbilt University Medical Center [Nashville] Vanderbilt University Medical Center [Nashville] Vanderbilt University Medical Center [Nashville] Centre d'investigation clinique Paris Est [CHU Pitié Salpêtrière] CHU Pitié-Salpêtrière [AP-HP]
• Publié dans Autoimmunity Reviews le 28/10/2020

---

Résumé : Background: In addition to restoring anti-tumor immune responses, immune checkpoint inhibitors (ICI) may also induce immune-related adverse events (irAE) that can affect any organ. We aim to determine the spectrum, timing, clinical features, and fatalities of rheumatic and musculoskeletal immune-related adverse events (RMS-irAE) associated with ICI. Patients methods: We performed an observational, retrospective, pharmacovigilance study using the World Health Organization international pharmacovigilance database, VigiBase, from inception to January 2019. RMS-irAE reporting rate on ICI versus full database was performed using disproportionality analysis with computation of reporting-odds-ratios (ROR) and a Bayesian disproportional estimate (information component, IC). IC025 (lower end of the IC 95% credibility interval) >0 is deemed significant. Results: We identified 1288 RMS-irAE significantly associated with ICI: polymyalgia rheumatica (n = 76, ROR = 14.6 [11.6-18.4], IC025 = 3.34), sarcoidosis (n = 94; ROR = 9.6 [7.9-11.9]; IC025 = 2.85), Sjogren's syndrome (n = 49; ROR = 6.9 [5.2-9.2]; IC025 = 2.24), myositis (n = 465; ROR = 4.9 [4.5-5.4]; IC025 = 2.12), arthritis (n = 606; ROR = 1.4 [1.3-1.5]; IC025 = 0.34) and scleroderma (n = 17; ROR = 2.0 [1.2-3.2]; IC025 = 0.17). Arthritis, myositis, and Sjogren's syndrome were over-reported in patients treated with ICI combination versus those treated with ICI monotherapy (ROR = 1.6-2.9, p < .05) and more frequently reported on anti-PD1/PDL1 monotherapy vs. anti-CTLA4 monotherapy (2.1-4.4, p < .05). Median time to onset occurred early for myositis (31 days [19.2-57.8]) and was the most delayed for scleroderma (395 days [323.8-457.2], p < .0001). The fatality rate for RMS-irAE ranged from 24% for myositis (n = 106/441) (up to 56.7% with concurrent myocarditis) to [0-6.7%] for other RMS-irAE (p < .0001). Conclusions: Clinicians should be aware of the spectrum of RMS-irAE. Myositis can be particularly life-threatening, particularly when associated with myocarditis.

---

Fichiers liés : jitc-2022-004699.pdf

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/08/2020
• Auteurs : R. Garcia LopezA. NattaAlessio Caratti O GarattiT. P. RayR. FedrianiMaria KoutoulakiLucia KlarmannK. PerrautJoel Sanchez-BermudezMyriam BenistyCatherine DougadosLucas LabadieW. BrandnerP. J. V. GarciaThomas HenningPaola CaselliGilles DuvertTim de ZeeuwRebekka GrellmannRoberto AbuterAntonio AmorimMichi BauböckJean-Philippe BergerH. BonnetA. BuronYann ClénetVincent Coudé Du ForestoW. de WitAndreas EckartF. EisenhauerM. FilhoFei GaoC. E. Garcia DaboÉric GendronReinhard GenzelS. GillessenM. HabibiXavier HauboisF. HaussmannS. HipplerZoltan HubertM. HorrobinA. Jiménez-RosalesLaurent JocouPierre KervellaJ. KolbSylvestre LacourJean-Baptiste Le BouquinP. LénaT. OttThibaut PaumardS. A. WiederkehrO. PfuhlA. RamirezC. RauG. RoussetSilvia ScheithauerJinyi ShangguanJ. StadlerO. StraubC. StraubmeierE. SturmEwine Van dishoeckF. VincentSebastiano von FellenbergFelix WidmannEkkehard WieprechtM. WiestErich WiezorrekJulien WoillezSenol YaziciGérard Zins
• Organismes : Institut de Planétologie et d'Astrophysique de Grenoble Institut de Planétologie et d'Astrophysique de Grenoble Institut de Planétologie et d'Astrophysique de Grenoble Institut de Planétologie et d'Astrophysique de Grenoble Institut de Planétologie et d'Astrophysique de Grenoble Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics Max-Planck-Institut für Extraterrestrische Physik European Southern Observatory Max-Planck-Institut für Astronomie Institut de Planétologie et d'Astrophysique de Grenoble Institut de Planétologie et d'Astrophysique de Grenoble Observatoire de Paris Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics Institut de Planétologie et d'Astrophysique de Grenoble
• Publié dans Nature le 29/10/2020

---

Résumé : Stars form by accreting material from their surrounding disks. There is a consensus that matter flowing through the disk is channelled onto the stellar surface by the stellar magnetic field. This is thought to be strong enough to truncate the disk close to the corotation radius, at which the disk rotates at the same rate as the star. Spectro-interferometric studies in young stellar objects show that hydrogen emission (a well known tracer of accretion activity) mostly comes from a region a few milliarcseconds across, usually located within the dust sublimation radius1-3. The origin of the hydrogen emission could be the stellar magnetosphere, a rotating wind or a disk. In the case of intermediate-mass Herbig AeBe stars, the fact that Brackett γ (Brγ) emission is spatially resolved rules out the possibility that most of the emission comes from the magnetosphere4-6 because the weak magnetic fields (some tenths of a gauss) detected in these sources7,8 result in very compact magnetospheres. In the case of T Tauri sources, their larger magnetospheres should make them easier to resolve. The small angular size of the magnetosphere (a few tenths of a milliarcsecond), however, along with the presence of winds9,10 make the interpretation of the observations challenging. Here we report optical long-baseline interferometric observations that spatially resolve the inner disk of the T Tauri star TW Hydrae. We find that the near-infrared hydrogen emission comes from a region approximately 3.5 stellar radii across. This region is within the continuum dusty disk emitting region (7 stellar radii across) and also within the corotation radius, which is twice as big. This indicates that the hydrogen emission originates in the accretion columns (funnel flows of matter accreting onto the star), as expected in magnetospheric accretion models, rather than in a wind emitted at much larger distance (more than one astronomical unit).

---

Fichiers liés : 2104.06441v1.pdf

---

Source