J/A+A/688/A179ivo://CDS.VizieR/J/A+A/688/A179doi:10.26093/cds/vizier.36880179CDSMasson A.Vinatier S.Bezard B.Lopez-Puertas M.Lampon M.Debras F.,Carmona A.Klein B.Artigau E.Dethier W.Pelletier S.Hood T.,Allart R.Bourrier V.Cadieux C.Charnay B.Cowan N.B.Cook N.J.,Delfosse X.Donati J.-F.Gu P.-G.Hebrard G.Martioli E.Moutou C.,Venot O.Wyttenbach A.2024-11-21T20:02:37Z2024-08-21T08:28:44ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frmultiple-starsexoplanetsspectroscopyinfrared-astronomyFor several years, the metastable helium triplet line has been successfully used as a tracer to probe atmospheric escape in transiting exoplanets. This absorption in the near-infrared (1083.3nm) can be observed from the ground using high-resolution spectroscopy, providing new constraints on the mass-loss rate and the temperature characterizing the upper atmosphere of close-in exoplanets. The aim of this work is to search for the He triplet signature in 15 transiting exoplanets -- ranging from super-Earths to ultrahot Jupiters -- observed with SPIRou, a high-resolution (R~70000) near-infrared spectropolarimeter at the CFHT, in order to bring new constraints or to improve existing ones regarding atmospheric escape through a homogeneous study. We developed a full data processing and analysis pipeline to correct for the residual telluric and stellar contributions. We then used two different 1D models based on the Parker-wind equations and nonlocal thermodynamic equilibrium (NLTE) radiative transfer to interpret the observational results. We confirm published He triplet detections for HAT-P-11 b, HD 189733 b, and WASP-69 b. We tentatively detect the signature of escaping He in HD 209458 b, GJ 3470 b, and WASP-76 b. We report new constraints on the mass-loss rate and temperature for our three detections and set upper limits for the tentative and nondetections. We notably report improved constraints on the mass-loss rate and temperature of the escaping gas for TOI-1807 b, and report a nondetection for the debated atmospheric escape in GJ 1214 b. We also conducted the first search for the He signature in GJ 486 b since its discovery and report a nondetection of the He triplet. Finally, we studied the impact of important model assumptions on our retrieved parameters, notably the limitations of 1D models and the influence of the H/He ratio on the derived constraints.2024A&A...688A.179Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/688/A179CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/688/A179https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/688/A179http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/688/A179https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/688/A179https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/688/A179http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/688/A179GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/688/A179/sources (List of studied sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/688/A179/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/688/A179/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/688/A179/sources?GETtext/xml+votable180.050000true133.15416728.3338890.0055555555555555560/https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/688/A179?format=asciiInfrareddefaultJ/A+A/688/A179/sourcesList of studied sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNamemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainspShow the spectrummeta.ref.urlcharFileNameName of the spectrum file in subdirectory spmeta.id;meta.filecharSimbadSimbad column added by the CDSmeta.ref.urlchar