J/AJ/150/197ivo://CDS.VizieR/J/AJ/150/197doi:10.26093/cds/vizier.51500197CDSHartman J.D.Bakos G.A.Buchhave L.A.Torres G.Latham D.W.Kovacs G.,Bhatti W.Csubry Z.de Val-Borro M.Penev K.Huang C.X.Beky B.,Bieryla A.Quinn S.N.Howard A.W.Marcy G.W.Johnson J.A.Isaacson H.,Fischer D.A.Noyes R.W.Falco E.Esquerdo G.A.Knox R.P.Hinz P.,Lazar J.Papp I.Sari P.2017-06-13T11:09:05Z2016-05-18T15:39:08ZCDS support team

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

cds-question@unistra.frsolar-system-planetsmultiple-starsphotometryradial-velocityWe present the discovery of HAT-P-57b, a P=2.4653 day transiting planet around a V=10.465+/-0.029mag, T_eff_=7500+/-250K main sequence A8V star with a projected rotation velocity of vsini=102.1+/-1.3km/s. We measure the radius of the planet to be R=1.413+/-0.054R_J_ and, based on RV observations, place a 95% confidence upper limit on its mass of M<1.85M_J_. Based on theoretical stellar evolution models, the host star has a mass and radius of 1.47+/-0.12M_{sun}_ and 1.500+/-0.050R_{sun}_, respectively. Spectroscopic observations made with Keck-I/HIRES during a partial transit event show the Doppler shadow of HAT-P-57b moving across the average spectral line profile of HAT-P-57, confirming the object as a planetary system. We use these observations, together with analytic formulae that we derive for the line profile distortions, to determine the projected angle between the spin axis of HAT-P-57 and the orbital axis of HAT-P-57b. The data permit two possible solutions, with -16.7{deg}<{lambda}<3.3{deg} or 27.6{deg}<{lambda}<57.4{deg} at 95% confidence, and with relative probabilities for the two modes of 26% and 74%, respectively. Adaptive optics imaging with MMT/Clio2 reveals an object located 2.7" from HAT-P-57 consisting of two point sources separated in turn from each other by 0.22". The H- and L'-band magnitudes of the companion stars are consistent with their being physically associated with HAT-P-57, in which case they are stars of mass 0.61+/-0.10M_{sun}_ and 0.53+/-0.08M_{sun}_. HAT-P-57 is the most rapidly rotating star, and only the fourth main sequence A star, known to host a transiting planet.2015AJ....150..197Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/150/197CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AJ/147/128 : HAT-P-44, HAT-P-45, and HAT-P-46 follow-up (Hartman+, 2014)J/AJ/147/84 : Photometry and spectroscopy of HAT-P-49 (Bieryla+, 2014)J/AJ/144/139 : HAT-P-39, HAT-P-40, and HAT-P-41 follow-up (Hartman+, 2012)J/ApJ/710/1724 : Follow-up photometry for HAT-P-11 (Bakos+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/150/197https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/150/197http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/150/197https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/150/197https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/150/197http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/150/197GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/150/197/table2Radial velocities and bisector span measurements of HAT-P-57 from Keck-I/HIRESPhase[0/1] Phase (6)time.phasefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[374.8/997.1] Barycentric Julian Date (BJD-2455000) (1)dtime.epochdoubleRV1[-626/368]? Radial velocity computed using the I_2_ method (2)m/sspect.dopplerVeloc;meta.modelledintnullablee_RV1[45/95]? The 1{sigma} error in RV1 (3)m/sstat.errorintnullableRV2[-10.9/-6.9]? Radial velocity computed using the CCF method, applied only to the I_2_-free blue spectral orders (4)km/sspect.dopplerVeloc;meta.modelledfloatnullablee_RV2[0.8/1.1]? The 1{sigma} error in RV2 (4)km/sstat.errorfloatnullableRV3[-9.6/-6.7]? Radial velocity computed using the CCF method, applied to the blue and green spectral orders (5)km/sspect.dopplerVeloc;meta.modelledfloatnullablee_RV3[0.67/0.81]? The 1{sigma} error in RV3km/sstat.errorfloatnullableBS[-259/350]? Bisector spanm/sphys.velocintnullablee_BS[36/108]? 1{sigma} error in BSm/sstat.errorintnullableJ/AJ/150/197/table1Differential photometry of HAT-P-57recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDUTC Barycentric Julian date (BJD-2400000) (1)dtime.epochdoubleDmag[-0.027/0.026] Observed differential magnitude in Flt (2)magphot.mag;arith.diffdoublee_Dmag[0.0007/0.008] Uncertainty in Dmagmagstat.error;phot.mag;arith.diffdoubleomag[9.4/9.9]? Raw, observed magnitude (3)magphot.magdoublenullableFlt[griz] Filter used in observation (g, r, i, or z)instr.setup;obscharInstInstrument used (HATNet or KeplerCam) (4)instr.setupchar