J/AJ/165/264ivo://CDS.VizieR/J/AJ/165/264doi:10.26093/cds/vizier/be-55-88CDSBennett K.A.Redfield S.Oklopcic A.Carleo I.Ninan J.P.Endl M.2026-07-02T11:44:31Z2023-11-06T07:34:47ZCDS support team

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

cds-question@unistra.frexoplanetsf-starsinfrared-astronomyspectroscopystellar-spectral-typesstellar-agesstellar-radiistellar-massesstellar-distanceHot Jupiters orbiting extremely close to their host star may experience atmospheri; c escape due to the large amounts of high-energy radiation they receive. Understanding the conditions under which this occurs is critical, as atmospheric escape is believed to be a driving factor in sculpting planetary populations. In recent years, the near-infrared 10833{AA} helium feature has been found to be a promising spectral signature of atmospheric escape. We use transmission spectroscopy to search for excess helium absorption in the extended atmosphere of WASP-48b, a hot Jupiter orbiting a slightly evolved, rapidly rotating F star. The data were collected using the Habitable-zone Planet Finder spectrograph on the Hobby-Eberly Telescope. Observations were taken over the course of seven nights, from which we obtain three transits. No detectable helium absorption is seen, as absorption depth is measured to -0.0025{+/-}0.0021, or 1.2{sigma} from a null detection. This nondetection follows our current understanding of decreasing stellar activity (and thus high-energy radiation) with age. We use a 1D isothermal Parker wind model to compare with our observations and find that our nondetection can best be explained with a low planetary mass-loss rate and high thermosphere temperature. We explore our results within the context of the full sample of helium detections and nondetections to date. Surprisingly, comparing helium absorption with the stellar activity index logR'_HK_ reveals a large spread in the correlation between these two factors, suggesting that there are additional parameters influencing the helium absorption strength.2023AJ....165..264Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/165/264CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/415/1153 : [Fe/H] for 98 extra-solar planet-host stars (Santos+, 2004)J/ApJ/710/1724 : Follow-up photometry for HAT-P-11 (Bakos+, 2010)J/ApJ/726/52 : HAT-P-18 and HAT-P-19 follow-up (Hartman+, 2011)J/ApJ/742/59 : HAT-P-32 and HAT-P-33 follow-up (Hartman+, 2011)J/ApJ/743/48 : Stars with Prot and X-ray luminosities (Wright+, 2011)J/A+A/546/A27 : Radial velocity and photometry for GJ3470 (Bonfils+, 2012)J/A+A/549/A10 : Transits of GJ 1214 (Harpsoe+, 2013)J/A+A/549/A134 : 4 new WASP transiting closein giant planets (Hebrard+, 2013)J/A+A/551/A80 : WASP-80 photometric and radial velocity data (Triaud+, 2013)J/MNRAS/445/1114 : WASP-69b, WASP-70Ab and WASP-84b (Anderson+, 2014)J/A+A/563/A21 : GJ 1214 Trappist and Spitzer light curves (Gillon+, 2014)J/A+A/585/A126 : 3 irradiated & bloated hot Jupiters RV & phot. (West+, 2016)J/A+A/602/A107 : 231 transiting planets eccentricity and mass (Bonomo+, 2017)J/AJ/154/109 : California-Kepler Survey. III. Planet radii (Fulton+, 2017)J/A+A/599/A3 : WASP 127, 136 and 138 RV and light curves (Lam+, 2017)J/ApJ/836/77 : Library of high-S/N optical spectra FGKM stars (Yee+, 2017)J/A+A/616/A108 : Cool stars chromospheric activity cat. (Boro Saikia+, 2018)J/A+A/619/A1 : 55 Cnc radial velocities and photometry (Bourrier+, 2018)J/AJ/157/97 : Radial velocity measurements K2-3 & GJ3470 (Kosiarek+, 2019)J/MNRAS/484/3731 : GJ 9827 HARPS-N RV data (Rice+, 2019)J/MNRAS/485/5790 : WASP-177, WASP-181, WASP-183 RV & phot. data (Turner+, 2019)J/AJ/159/239 : Transmission Spectroscopy Metric of exoplanets (Guo+, 2020)J/A+A/644/A67 : EUV estimates from CaII H&K activity (Sreejith+, 2020)J/AJ/159/278 : He-filter obs. of WASP-69b & WASP-52b (Vissapragada+, 2020)J/AJ/162/82 : IRD &HPF spectra of TRAPPIST-1b,e & f (Krishnamurthy+, 2021)J/AJ/161/70 : RVel for WASP-107 with HIRES & CORALIE (Piaulet+, 2021)J/A+A/664/A163 : TOI-1807 RV and flux curves (Nardiello+, 2022)J/AJ/163/68 : Fiducial stellar spectrum of HD 63433 (Zhang+, 2022)J/AJ/163/67 : 5-55000{AA} spectrum of TOI 560 (Zhang+, 2022)http://exoplanetarchive.ipac.caltech.edu : NASA Exoplanets Archivehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/165/264https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/165/264http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/165/264https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/165/264https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/165/264http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/165/264GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/165/264/table5 (*Stellar and planetary parameters for exoplanets with published helium results)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/165/264/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/165/264/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/165/264/table5?GETtext/xml+votable180.050000true188.3868506-10.14617390.0055555555555555566/368 1083 2532 4651 5009 6217 8235 9482 10491 10593 12644 12983 14667 14825 14847 14896 15218 17851 18726 18785 18943 19024 24409 25427 26062 26844 28400 28548 30009 31216 40833 49103https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/165/264?format=asciiInfrareddefaultJ/AJ/165/264/table5*Stellar and planetary parameters for exoplanets with published helium resultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTeq[219.0/4050.0] Planetary equilibrium temperatureKphys.temperaturefloatE_Teq[4.2/180.0]? Upper uncertainty in TeqKstat.error;stat.maxfloatnullablee_Teq[4.2/180.0]? Lower uncertainty in TeqKstat.errorfloatnullabler_TeqReference for Teq (1)meta.ref;pos.framecharlogg[2.33/3.35]? log planetary surface gravitylog(cm.s**-2)phys.gravityfloatnullableSimbadNameSimbad column added by the CDSmeta.idcharnullableDist[9.75/455] Distancepcpos.distancedoubleE_Dist[0.008/7]? Upper uncertainty in Distpcstat.error;stat.maxdoublenullablee_Dist[0.008/6] Lower uncertainty in Distpcstat.errordoubler_DistReference code for Dis (1)meta.ref;pos.framecharSpTypeSpectral typesrc.spTypecharr_SpTypeReference code for SpType (1)meta.ref;pos.framecharTeff[2566/10170] Effective temperatureKphys.temperature.effectiveintE_Teff[18/450] Upper uncertainty in TeffKstat.error;stat.maxinte_Teff[18/450] Lower uncertainty in TeffKstat.error;phys.temperature.effectiveintr_TeffReference code for Teff (1)meta.ref;pos.framecharAge[0.023/12.4]? Stellar ageGyrtime.agefloatnullableE_Age[0.004/5.9]? Upper uncertainty in AgeGyrstat.error;stat.maxfloatnullablee_Age[0.004/10.0]? Lower uncertainty in AgeGyrstat.error;time.agefloatnullabler_AgeReference code for Age (1)meta.ref;pos.framecharRad[0.1192/2.362] Stellar radiussolRadphys.size.radiusfloatE_Rad[0.0013/0.098] Upper uncertainty in RadsolRadstat.error;stat.maxfloate_Rad[0.0013/0.09] Lower uncertainty in RadsolRadstat.errorfloatr_RadReference code for Radius (1)meta.ref;pos.framecharMass[0.0898/2.52] Stellar masssolMassphys.massfloatE_Mass[0.0023/0.25] Upper uncertainty in MasssolMassstat.error;stat.maxfloate_Mass[0.0023/0.2] Lower uncertainty in MasssolMassstat.error;phys.massfloatr_MassReference code for Mass (1)meta.refchar[Fe/H][-0.28/0.35]? Stellar metallicitylog(Sun)phys.abund.FefloatnullableE_[Fe/H][0.02/0.2]? Upper uncertainty in [Fe/H]log(Sun)stat.error;stat.maxfloatnullablee_[Fe/H][0.02/0.2]? Lower uncertainty in [Fe/H]log(Sun)stat.error;phys.abund.Fefloatnullabler_[Fe/H]Reference code for [Fe/H] (1)meta.refcharl_vsiniLimit flag on vsin(i)meta.code.error;phys.veloc.rotatcharvsini[0.21/111.4]? Stellar projected rotational velocitykm/sphys.veloc.rotatfloatnullableE_vsini[0.01/2.0]? Upper uncertainty in vsin(i)km/sstat.error;stat.maxfloatnullablee_vsini[0.01/2.0]? Lower uncertainty in vsin(i)km/sstat.error;phys.veloc.rotatfloatnullabler_vsiniReference code for vsin(i) (1)meta.refcharlogRHK[-5.5/-4.04]? Stellar log R'_HK_ indexphot.flux;arith.ratiofloatnullablee_logRHK[0.001/0.2]? Uncertainty in logR'HKstat.errorfloatnullabler_logRHKReference code for logR'HK (1)meta.ref;pos.framecharRadp[0.0821/1.891] Planetary radius(7.1492x10+7m)phys.size.radiusdoubleE_Radp[0.00116/0.66] Upper uncertainty in Radp(7.1492x10+7m)stat.error;stat.maxdoublee_Radp[0.00107/0.36] Lower uncertainty in Radp(7.1492x10+7m)stat.errordoubler_RadpReference code for Radp (1)meta.ref;pos.framecharMassp[0.00218/2.88]? Planetary mass(1.898187x10+27kg)phys.massdoublenullableE_Massp[7e-05/0.84]? Upper uncertainty in Massp(1.898187x10+27kg)stat.error;stat.maxdoublenullablee_Massp[7e-05/0.84]? Lower uncertainty in Massp(1.898187x10+27kg)stat.errordoublenullabler_MasspReference code for Massp (1)meta.ref;pos.framechara[0.01154/0.1688] Planetary semi-major axisAUphys.size.smajAxisdoubleE_a[5e-05/0.0062]? Upper uncertainty in aAUstat.error;stat.maxdoublenullablee_a[5e-05/0.0101]? Lower uncertainty in aAUstat.errordoublenullabler_aReference code for ameta.bibcharE_logg[0.005/2.8]? Upper uncertainty in logglog(cm.s**-2)stat.error;stat.maxfloatnullablee_logg[0.005/2.8]? Lower uncertainty in logglog(cm.s**-2)stat.errorfloatnullabler_loggReference for logg (1)meta.ref;pos.framechardeltaRp[0.002/7.58] Change in transit depth at helium featurestat.paramfloate_deltaRp[0.05/25.52] Uncertainty in deltaRpstat.errorfloatr_deltaRpReference code for deltaRp (1)meta.ref;pos.framecharRatio[0.29/125.3]? Normalized atmospheric height of helium signaturemeta.codefloatnullablee_Ratio[0.004/82.9]? Uncertainty in Ratiostat.error;arith.ratiofloatnullabler_RatioReference code for Ratio (1)meta.ref;pos.frame;arith.ratiocharDetect?Detection? Yes/Nometa.codechar_RAPosition from SIMBAD (right ascension part)degpos.eq.ra;meta.main_DEPosition from SIMBAD (declination part)degpos.eq.dec;meta.mainPlanetPlanet identifiermeta.id;meta.mainchar