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HAT-P-57b: A Short-period Giant Planet Transiting a Bright Rapidly Rotating A8V Star Confirmed Via Doppler Tomography

Author(s): Hartman, Joel D.; Bakos, Gaspar Aron; Buchhave, Lars A.; Torres, G; Latham, David W.; et al

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dc.contributor.authorHartman, Joel D.-
dc.contributor.authorBakos, Gaspar Aron-
dc.contributor.authorBuchhave, Lars A.-
dc.contributor.authorTorres, G-
dc.contributor.authorLatham, David W.-
dc.contributor.authorKovács, G-
dc.contributor.authorBhatti, W-
dc.contributor.authorCsubry, Zoltan-
dc.contributor.authorde Val-Borro, Miguel-
dc.contributor.authorPenev, K-
dc.contributor.authorHuang, CX-
dc.contributor.authorBéky, B-
dc.contributor.authorBieryla, A-
dc.contributor.authorQuinn, SN-
dc.contributor.authorHoward, AW-
dc.contributor.authorMarcy, GW-
dc.contributor.authorJohnson, JA-
dc.contributor.authorIsaacson, H-
dc.contributor.authorFischer, DA-
dc.contributor.authorNoyes, Robert W.-
dc.contributor.authorFalco, E-
dc.contributor.authorEsquerdo, GA-
dc.contributor.authorKnox, RP-
dc.contributor.authorHinz, P-
dc.contributor.authorLázár, J.-
dc.contributor.authorPapp, I-
dc.contributor.authorSári, P-
dc.date.accessioned2019-04-10T19:31:23Z-
dc.date.available2019-04-10T19:31:23Z-
dc.date.issued2015-12en_US
dc.identifier.citationHartman, JD, Bakos, GÁ, Buchhave, LA, Torres, G, Latham, DW, Kovács, G, Bhatti, W, Csubry, Z, de Val-Borro, M, Penev, K, Huang, CX, Béky, B, Bieryla, A, Quinn, SN, Howard, AW, Marcy, GW, Johnson, JA, Isaacson, H, Fischer, DA, Noyes, RW, Falco, E, Esquerdo, GA, Knox, RP, Hinz, P, Lázár, J, Papp, I, Sári, P. (2015). HAT-P-57b: A Short-period Giant Planet Transiting a Bright Rapidly Rotating A8V Star Confirmed Via Doppler Tomography. \aj, 150 (197 - 197. doi:10.1088/0004-6256/150/6/197en_US
dc.identifier.urihttp://arks.princeton.edu/ark:/88435/pr1vx10-
dc.description.abstractWe present the discovery of HAT-P-57b, a P = 2.4653 day transiting planet around a V =  10.465 0.029 mag, Teff =  7500 250 K main sequence A8V star with a projected rotation velocity of v i sin 102.1 1. =  3 km s-1 . We measure the radius of the planet to be R =  1.413 0.054 RJ and, based on RV observations, place a 95% confidence upper limit on its mass of M < 1.85 MJ. Based on theoretical stellar evolution models, the host star has a mass and radius of 1.47 0.1  2 M and 1.500 0.050  R, 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 3 .  < <l 3 or 27 . 6 57 . 4  < <l  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 0.10  M and 0.53 0.08  M. HAT-P-57 is the most rapidly rotating star, and only the fourth main sequence A star, known to host a transiting planet.en_US
dc.language.isoen_USen_US
dc.relation.ispartofAstronomical Journalen_US
dc.rightsFinal published version. This is an open access article.en_US
dc.titleHAT-P-57b: A Short-period Giant Planet Transiting a Bright Rapidly Rotating A8V Star Confirmed Via Doppler Tomographyen_US
dc.typeJournal Articleen_US
dc.identifier.doidoi:10.1088/0004-6256/150/6/197-
dc.date.eissued2015-12-11en_US
pu.type.symplectichttp://www.symplectic.co.uk/publications/atom-terms/1.0/journal-articleen_US

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