J/AJ/164/110ivo://CDS.VizieR/J/AJ/164/110doi:10.26093/cds/vizier.51640110CDSFeinstein A.D.France K.Youngblood A.Duvvuri G.M.Teal D.J.,Cauley P.W.Seligman D.Z.Gaidos E.Kempton E.M.-R.Bean J.L.,Diamond-Lowe H.Newton E.Ginzburg S.Plavchan P.Gao P.Schlichting H.2023-03-20T14:01:11Z2023-01-30T06:30:32ZCDS support team

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

cds-question@unistra.frm-starsstellar-flaresspectroscopyultraviolet-astronomyHigh-energy X-ray and ultraviolet (UV) radiation from young stars impacts planetary atmospheric chemistry and mass loss. The active ~22Myr M-dwarf AU-Mic hosts two exoplanets orbiting interior to its debris disk. Therefore, this system provides a unique opportunity to quantify the effects of stellar X-ray and UV irradiation on planetary atmospheres as a function of both age and orbital separation. In this paper, we present over 5hr of far-UV (FUV) observations of AU-Mic taken with the Cosmic Origins Spectrograph (COS; 1070-1360{AA}) on the Hubble Space Telescope (HST). We provide an itemization of 120 emission features in the HST/COS FUV spectrum and quantify the flux contributions from formation temperatures ranging from 104 to 107K. We detect 13 flares in the FUV white-light curve with energies ranging from 1029 to 1031erg/s. The majority of the energy in each of these flares is released from the transition region between the chromosphere and the corona. There is a 100x increase in flux at continuum wavelengths {lambda}<1100{AA} in each flare, which may be caused by thermal Bremsstrahlung emission. We calculate that the baseline atmospheric mass-loss rate for AU-Micb is ~108g/s, although this rate can be as high as ~1014g/s during flares with L_flare_~10^33^erg/s. Finally, we model the transmission spectra for AU-Micb and c with a new panchromatic spectrum of AU Mic and motivate future JWST observations of these planets.2022AJ....164..110Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/164/110CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)J/A+AS/125/149 : CHIANTI - Atomic Database For Emission Lines I. (Dere+ 1997)J/AJ/141/50 : White-light flares on cool stars from Kepler (Walkowicz+, 2011)J/ApJS/207/15 : M dwarf flare spectra (Kowalski+, 2013)J/ApJ/829/23 : Stellar flares from Q0-Q17 Kepler LCs (Davenport, 2016)J/ApJ/843/31 : MUSCLES Treasury Survey IV Mdwarf UV fluxes (Youngblood+, 2017)J/ApJ/881/9 : EvryFlare. I. Cool stars flares in southern sky (Howard+, 2019)J/A+A/622/A133 : M45, M44 and M67 flare stars (Ilin+, 2019)J/AJ/159/60 : 8695 flares; 1228 stars in TESS sectors 1 & 2 (Gunther+, 2020)J/ApJ/895/140 : EvryFlare. II. Parameters 122 cool flare stars (Howard+, 2020)J/ApJ/890/23 : NUV and FUV measurements of planet host stars (Loyd+, 2020)J/A+A/645/A42 : Flares in 5 open clusters (Ilin+, 2021)J/AJ/163/121 : Radial velocity and light curve of Kepler 1627A (Bouma+, 2022)J/AJ/163/156 : THYME. VI. TOI-1227 radial velocity (Mann+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/164/110https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/164/110http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/164/110https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/164/110https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/164/110http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/164/110GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVdefaultJ/AJ/164/110/tablea1Complete line list for emission features in our Hubble/COS spectra for AU MicIonIonphys.atmol.ionStagecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintf_Ion[*] Flag on Ion (1)meta.codecharWaver[1083/1360] Measured rest wavelength ({lambda}_rest_; {AA})0.1nmem.wlfloatWave[1083/1360] Observation wavelength ({lambda}_obs_; {AA})0.1nmem.wlfloatdVel[-22.9/25.4] Velocity shiftkm/sphys.veloc;phys.atmol.lineShiftfloatFluxQ[0.43/150] Flux Quiescent (10^-15^erg/s/cm^2^)phot.flux;em.UVfloate_FluxQ[0.1/6] Error on Flux-Qstat.errorfloatFWHMQ[0.19/0.77] FWHM Quiescentkm/sspect.line.widthfloate_FWHMQ[0/0.06] Error on FWHM-Qkm/sstat.errorfloatFluxB[0.61/223] Flux flare B (10^-15^erg/s/cm^2^)phot.flux;em.UVfloate_FluxB[0.3/22] Error on Flux-Bstat.errorfloatFWHMB[0.17/1.68] FWHM flare Bkm/sspect.line.widthfloate_FWHMB[0.01/3] Error on FWHM-Bkm/sstat.errorfloat