J/AJ/159/278ivo://CDS.VizieR/J/AJ/159/278doi:10.26093/cds/vizier.51590278CDSVissapragada S.Knutson H.A.Jovanovic N.Harada C.K.Oklopcic A.,Eriksen J.Mawet D.Millar-Blanchaer M.A.Tinyanont S.Vasisht G.2021-01-19T12:38:37Z2020-09-16T08:22:45ZCDS support team

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

cds-question@unistra.frexoplanetsinfrared-photometryInfrared observations of metastable 23S helium absorption with ground- and space-based spectroscopy are rapidly maturing, as this species is a unique probe of exoplanet atmospheres. Specifically, the transit depth in the triplet feature (with vacuum wavelengths near 1083.3nm) can be used to constrain the temperature and mass-loss rate of an exoplanet's upper atmosphere. Here, we present a new photometric technique to measure metastable 23S helium absorption using an ultranarrowband filter (FWHM 0.635nm) coupled to a beam-shaping diffuser installed in the Wide-field Infrared Camera on the 200inch Hale Telescope at Palomar Observatory. We use telluric OH lines and a helium arc lamp to characterize refractive effects through the filter and to confirm our understanding of the filter transmission profile. We benchmark our new technique by observing a transit of WASP-69b and detect an excess absorption of 0.498%{+/-}0.045% (11.1{sigma}), consistent with previous measurements after considering our bandpass. We then use this method to study the inflated gas giant WASP-52b and place a 95th percentile upper limit on excess absorption in our helium bandpass of 0.47%. Using an atmospheric escape model, we constrain the mass-loss rate for WASP-69b to be 5.25_-0.46_^+0.65^x10^-4^M_J_/Gyr (3.32_-0.56_^+0.67^x10^-3^M_J_/Gyr) at 7000K (12000K). Additionally, we set an upper limit on the mass-loss rate of WASP-52b at these temperatures of 2.1x10^-4^M_J_/Gyr (2.1x10^-3^M_J_/Gyr). These results show that ultranarrowband photometry can reliably quantify absorption in the metastable helium feature.2020AJ....159..278Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/159/278CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/549/A134 : 4 new WASP transiting close-in giant planets (Hebrard+,2013)J/MNRAS/445/1114 : WASP-69b, WASP-70Ab and WASP-84b (Anderson+, 2014)J/A+A/581/A47 : Lines and continuum sky emission in the NIR (Oliva+, 2015)J/A+A/586/A75 : Simulations of hot gas planets atmospheres (Salz+, 2016)J/A+A/608/A135 : Na detection in WASP-69b atmosphere (Casasayas-Barris+,2017)J/ApJ/839/97 : HeI 5876 & 10830{AA} EWs solar-type stars (Andretta+, 2017)J/A+A/600/L11 : GTC transit light curves of WASP-52b (Chen+, 2017)J/AJ/154/109 : California-Kepler Survey. III. Planet radii (Fulton+, 2017)J/MNRAS/465/843 : Light curves of WASP-52 (Mancini+, 2017)J/AJ/156/264 : California-Kepler Survey. VII. Planet radius (Fulton+, 2018)J/AJ/159/211 : Exoplanets parameters from Kepler and K2 (Cloutier+, 2020)J/A+A/634/L4 : HST/STIS FUV spectra of K2-18 (dos Santos+, 2020)J/ApJS/247/28 : K2 star param. from Gaia & LAMOST (Hardegree-Ullman+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/159/278https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/159/278http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/159/278https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/159/278https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/159/278http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/159/278GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/AJ/159/278/fig1Laboratory measurements of the helium filter transmission profilerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[0/29999] Sequential numbermeta.recordintwave[1070/1100] Wavelengthnmem.wl.effectivedoubletrans[0/0.96] Transmissionphys.transmission;instr.filterdoubleJ/AJ/159/278/fig4aUnbinned helium light curve, WASP-69brecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTime[-0.14/0.09] Time, days relative to transit centerdtime.epochdoubleFlux[0.97/1.01] Relative Fluxphot.flux.density;em.IRdoublee_Flux[0.002/0.003] Flux errorstat.error;phot.fluxdoubleJ/AJ/159/278/fig4bUnbinned helium light curve, WASP-52brecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTime[-0.15/0.07] Time, days relative to transit centerdtime.epochdoubleFlux[0.95/1.02] Relative Fluxphot.flux.density;em.IRdoublee_Flux[0.005/0.008] Flux errorstat.error;phot.fluxdouble