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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 660664.0, MPI für Astronomie / Publikationen_mpia
KELT-1b: A strongly irradiated, highly inflated, short period, 27 Jupiter-mass companion transiting a mid-F star
Authors:Siverd, R. J.; Beatty, T. G.; Pepper, J.; Eastman, J. D.; Collins, K.; Bieryla, A.; Latham, D. W.; Buchhave, L. A.; Jensen, E. L. N.; Crepp, J. R.; Street, R.; Stassun, K. G.; Gaudi, B. S.; Berlind, P.; Calkins, M. L.; DePoy, D. L.; Esquerdo, G. A.; Fulton, B. J.; Fűrész, G.; Geary, J. C.; Gould, A.; Hebb, L.; Kielkopf, J. F.; Marshall, J. L.; Pogge, R.; Stanek, K. Z.; Stefanik, R. P.; Szentgyorgyi, A. H.; Trueblood, M.; Trueblood, P.; Stutz, A. M.; van Saders, J. L.
Date of Publication (YYYY-MM-DD):2012
Journal Abbrev.:The Astrophysical Journal
Issue / Number:2
Start Page:id.123
Audience:Not Specified
Abstract / Description:We present the discovery of KELT-1b, the first transiting low-mass companion from the wide-field Kilodegree Extremely Little Telescope-North (KELT-North) transit survey. A joint analysis of the spectroscopic, radial velocity, and photometric data indicates that the V = 10.7 primary is a mildly evolved mid-F star with T eff = 6516 ± 49 K, log g = 4.228+0.014 –0.021, and [Fe/H] = 0.052 ± 0.079, with an inferred mass M * = 1.335 ± 0.063 M ☉ and radius R * = 1.471+0.045 –0.035 R ☉. The companion is a low-mass brown dwarf or a super-massive planet with mass MP = 27.38 ± 0.93 M Jup and radius RP = 1.116+0.038 –0.029 R Jup. The companion is on a very short (~29 hr) period circular orbit, with an ephemeris Tc (BJDTDB) = 2455909.29280 ± 0.00023 and P = 1.217501 ± 0.000018 days. KELT-1b receives a large amount of stellar insolation, resulting in an estimated equilibrium temperature assuming zero albedo and perfect redistribution of T eq = 2423+34 –27 K. Comparison with standard evolutionary models suggests that the radius of KELT-1b is likely to be significantly inflated. Adaptive optics imaging reveals a candidate stellar companion to KELT-1 with a separation of 588 ± 1 mas, which is consistent with an M dwarf if it is at the same distance as the primary. Rossiter-McLaughlin measurements during transit imply a projected spin-orbit alignment angle λ = 2 ± 16 deg, consistent with a zero obliquity for KELT-1. Finally, the vsin I * = 56 ± 2 km s–1 of the primary is consistent at ~2σ with tidal synchronization. Given the extreme parameters of the KELT-1 system, we expect it to provide an important testbed for theories of the emplacement and evolution of short-period companions, as well as theories of tidal dissipation and irradiated brown dwarf atmospheres.
Free Keywords:planetary systems; stars: individual: KELT-1; TYC 2785-2130-1; techniques: photometric; techniques: spectroscopic
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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