HAT-P-57b

A SHORT-PERIOD GIANT PLANET TRANSITING A BRIGHT RAPIDLY ROTATING A8V STAR CONFIRMED VIA DOPPLER TOMOGRAPHY

J. D. Hartman, G. Bakos, L. A. Buchhave, G. Torres, D. W. Latham, G. Kovács, W. Bhatti, Z. Csubry, M. De Val-Borro, K. Penev, C. X. Huang, B. Béky, A. Bieryla, S. N. Quinn, A. W. Howard, G. W. Marcy, J. A. Johnson, H. Isaacson, D. A. Fischer, R. W. Noyes & 7 others E. Falco, G. A. Esquerdo, R. P. Knox, Philip M Hinz, J. Lázár, I. Papp, P. Sári

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

We 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 sin i = 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 ± 0.12 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 <l <3°.3 or 27°.6 <l <57°.4 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.

Original languageEnglish (US)
Article number197
JournalAstronomical Journal
Volume150
Issue number6
DOIs
StatePublished - Dec 1 2015

Fingerprint

tomography
planets
planet
main sequence stars
stars
confidence
K stars
A stars
companion stars
radii
planetary systems
stellar evolution
ultrahigh frequencies
transit
profiles
adaptive optics
point sources
point source
line spectra
orbitals

Keywords

  • planetary systems
  • stars: individual (HAT-P-57)
  • techniques: photometric
  • techniques: spectroscopic

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Hartman, J. D., Bakos, G., Buchhave, L. A., Torres, G., Latham, D. W., Kovács, G., ... Sári, P. (2015). HAT-P-57b: A SHORT-PERIOD GIANT PLANET TRANSITING A BRIGHT RAPIDLY ROTATING A8V STAR CONFIRMED VIA DOPPLER TOMOGRAPHY. Astronomical Journal, 150(6), [197]. https://doi.org/10.1088/0004-6256/150/6/197

HAT-P-57b : A SHORT-PERIOD GIANT PLANET TRANSITING A BRIGHT RAPIDLY ROTATING A8V STAR CONFIRMED VIA DOPPLER TOMOGRAPHY. / Hartman, J. D.; Bakos, G.; Buchhave, L. A.; Torres, G.; Latham, D. W.; Kovács, G.; Bhatti, W.; Csubry, Z.; Val-Borro, M. De; Penev, K.; Huang, C. X.; Béky, 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, Philip M; Lázár, J.; Papp, I.; Sári, P.

In: Astronomical Journal, Vol. 150, No. 6, 197, 01.12.2015.

Research output: Contribution to journalArticle

Hartman, JD, Bakos, G, Buchhave, LA, Torres, G, Latham, DW, Kovács, G, Bhatti, W, Csubry, Z, Val-Borro, MD, 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, PM, 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', Astronomical Journal, vol. 150, no. 6, 197. https://doi.org/10.1088/0004-6256/150/6/197
Hartman, J. D. ; Bakos, G. ; Buchhave, L. A. ; Torres, G. ; Latham, D. W. ; Kovács, G. ; Bhatti, W. ; Csubry, Z. ; Val-Borro, M. De ; Penev, K. ; Huang, C. X. ; Béky, 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, Philip M ; Lázár, J. ; Papp, I. ; Sári, P. / HAT-P-57b : A SHORT-PERIOD GIANT PLANET TRANSITING A BRIGHT RAPIDLY ROTATING A8V STAR CONFIRMED VIA DOPPLER TOMOGRAPHY. In: Astronomical Journal. 2015 ; Vol. 150, No. 6.
@article{188876b757974d30924df125107e4826,
title = "HAT-P-57b: A SHORT-PERIOD GIANT PLANET TRANSITING A BRIGHT RAPIDLY ROTATING A8V STAR CONFIRMED VIA DOPPLER TOMOGRAPHY",
abstract = "We 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 sin i = 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 ± 0.12 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",
keywords = "planetary systems, stars: individual (HAT-P-57), techniques: photometric, techniques: spectroscopic",
author = "Hartman, {J. D.} and G. Bakos and Buchhave, {L. A.} and G. Torres and Latham, {D. W.} and G. Kov{\'a}cs and W. Bhatti and Z. Csubry and Val-Borro, {M. De} and K. Penev and Huang, {C. X.} and B. B{\'e}ky and A. Bieryla and Quinn, {S. N.} and Howard, {A. W.} and Marcy, {G. W.} and Johnson, {J. A.} and H. Isaacson and Fischer, {D. A.} and Noyes, {R. W.} and E. Falco and Esquerdo, {G. A.} and Knox, {R. P.} and Hinz, {Philip M} and J. L{\'a}z{\'a}r and I. Papp and P. S{\'a}ri",
year = "2015",
month = "12",
day = "1",
doi = "10.1088/0004-6256/150/6/197",
language = "English (US)",
volume = "150",
journal = "Astronomical Journal",
issn = "0004-6256",
publisher = "IOP Publishing Ltd.",
number = "6",

}

TY - JOUR

T1 - HAT-P-57b

T2 - A SHORT-PERIOD GIANT PLANET TRANSITING A BRIGHT RAPIDLY ROTATING A8V STAR CONFIRMED VIA DOPPLER TOMOGRAPHY

AU - Hartman, J. D.

AU - Bakos, G.

AU - Buchhave, L. A.

AU - Torres, G.

AU - Latham, D. W.

AU - Kovács, G.

AU - Bhatti, W.

AU - Csubry, Z.

AU - Val-Borro, M. De

AU - Penev, K.

AU - Huang, C. X.

AU - Béky, B.

AU - Bieryla, A.

AU - Quinn, S. N.

AU - Howard, A. W.

AU - Marcy, G. W.

AU - Johnson, J. A.

AU - Isaacson, H.

AU - Fischer, D. A.

AU - Noyes, R. W.

AU - Falco, E.

AU - Esquerdo, G. A.

AU - Knox, R. P.

AU - Hinz, Philip M

AU - Lázár, J.

AU - Papp, I.

AU - Sári, P.

PY - 2015/12/1

Y1 - 2015/12/1

N2 - We 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 sin i = 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 ± 0.12 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

AB - We 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 sin i = 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 ± 0.12 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

KW - planetary systems

KW - stars: individual (HAT-P-57)

KW - techniques: photometric

KW - techniques: spectroscopic

UR - http://www.scopus.com/inward/record.url?scp=84949676625&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84949676625&partnerID=8YFLogxK

U2 - 10.1088/0004-6256/150/6/197

DO - 10.1088/0004-6256/150/6/197

M3 - Article

VL - 150

JO - Astronomical Journal

JF - Astronomical Journal

SN - 0004-6256

IS - 6

M1 - 197

ER -