KELT-6b

A P ∼ 7.9 day hot saturn transiting a metal-poor star with a long-period companion

Karen A. Collins, Jason D. Eastman, Thomas Beatty, Robert J. Siverd, B. Scott Gaudi, Joshua Pepper, John F. Kielkopf, John Asher Johnson, Andrew W. Howard, Debra A. Fischer, Mark Manner, Allyson Bieryla, David W. Latham, Benjamin J. Fulton, Joao Gregorio, Lars A. Buchhave, Eric L.N. Jensen, Keivan G. Stassun, Kaloyan Penev, Justin R. Crepp & 22 others Sasha Hinkley, Rachel A. Street, Phillip Cargile, Claude E. MacK, Thomas E. Oberst, Ryan L. Avril, Samuel N. Mellon, Kim K. McLeod, Matthew T. Penny, Robert P. Stefanik, Perry Berlind, Michael L. Calkins, Qingqing Mao, Alexander J.W. Richert, Darren L. Depoy, Gilbert A. Esquerdo, Andrew Gould, Jennifer L. Marshall, Ryan J. Oelkers, Richard W. Pogge, Mark Trueblood, Patricia Trueblood

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

We report the discovery of KELT-6b, a mildly inflated Saturn-mass planet transiting a metal-poor host. The initial transit signal was identified in KELT-North survey data, and the planetary nature of the occulter was established using a combination of follow-up photometry, high-resolution imaging, high-resolution spectroscopy, and precise radial velocity measurements. The fiducial model from a global analysis including constraints from isochrones indicates that the V = 10.38 host star (BD+31 2447) is a mildly evolved, late-F star with T eff = 6102 ± 43 K, log g* = 4.07 +0.04 -0.07, and [Fe/H] = -0.28 ± 0.04, with an inferred mass M· = 1.09 ± 0.04M· and radius R· = 1.58+0.16 -0.09 R ·. The planetary companion has mass MP = 0.43 ± 0.05MJup, radius RP = 1.19+0.13 -0.08 RJup, surface gravity log gP = 2.86+0.06 -0.08, and density .P = 0.31+0.07 -0.08 g cm-3. The planet is on an orbit with semimajor axis a = 0.079 ± 0.001 AU and eccentricity e = 0.22+0.12 -0.10, which is roughly consistent with circular, and has ephemeris of Tc(BJDTDB) = 2456347.79679 ± 0.00036 and P = 7.845631 ± 0.000046 days. Equally plausible fits that employ empirical constraints on the host-star parameters rather than isochrones yield a larger planet mass and radius by ∼4}-7}. KELT-6b has surface gravity and incident flux similar to HD 209458b, but orbits a host that is more metal poor than HD 209458 by ∼0.3 dex. Thus, the KELT-6 system offers an opportunity to perform a comparative measurement of two similar planets in similar environments around stars of very different metallicities. The precise radial velocity data also reveal an acceleration indicative of a longer-period third body in the system, although the companion is not detected in Keck adaptive optics images.

Original languageEnglish (US)
Article number39
JournalAstronomical Journal
Volume147
Issue number2
DOIs
StatePublished - Feb 1 2014

Fingerprint

Saturn
planets
planet
stars
metal
radial velocity
metals
radii
late stars
gravity
gravitation
F stars
orbits
high resolution
transit
eccentricity
adaptive optics
velocity measurement
metallicity
photometry

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Collins, K. A., Eastman, J. D., Beatty, T., Siverd, R. J., Gaudi, B. S., Pepper, J., ... Trueblood, P. (2014). KELT-6b: A P ∼ 7.9 day hot saturn transiting a metal-poor star with a long-period companion. Astronomical Journal, 147(2), [39]. https://doi.org/10.1088/0004-6256/147/2/39
Collins, Karen A. ; Eastman, Jason D. ; Beatty, Thomas ; Siverd, Robert J. ; Gaudi, B. Scott ; Pepper, Joshua ; Kielkopf, John F. ; Johnson, John Asher ; Howard, Andrew W. ; Fischer, Debra A. ; Manner, Mark ; Bieryla, Allyson ; Latham, David W. ; Fulton, Benjamin J. ; Gregorio, Joao ; Buchhave, Lars A. ; Jensen, Eric L.N. ; Stassun, Keivan G. ; Penev, Kaloyan ; Crepp, Justin R. ; Hinkley, Sasha ; Street, Rachel A. ; Cargile, Phillip ; MacK, Claude E. ; Oberst, Thomas E. ; Avril, Ryan L. ; Mellon, Samuel N. ; McLeod, Kim K. ; Penny, Matthew T. ; Stefanik, Robert P. ; Berlind, Perry ; Calkins, Michael L. ; Mao, Qingqing ; Richert, Alexander J.W. ; Depoy, Darren L. ; Esquerdo, Gilbert A. ; Gould, Andrew ; Marshall, Jennifer L. ; Oelkers, Ryan J. ; Pogge, Richard W. ; Trueblood, Mark ; Trueblood, Patricia. / KELT-6b : A P ∼ 7.9 day hot saturn transiting a metal-poor star with a long-period companion. In: Astronomical Journal. 2014 ; Vol. 147, No. 2.
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title = "KELT-6b: A P ∼ 7.9 day hot saturn transiting a metal-poor star with a long-period companion",
abstract = "We report the discovery of KELT-6b, a mildly inflated Saturn-mass planet transiting a metal-poor host. The initial transit signal was identified in KELT-North survey data, and the planetary nature of the occulter was established using a combination of follow-up photometry, high-resolution imaging, high-resolution spectroscopy, and precise radial velocity measurements. The fiducial model from a global analysis including constraints from isochrones indicates that the V = 10.38 host star (BD+31 2447) is a mildly evolved, late-F star with T eff = 6102 ± 43 K, log g* = 4.07 +0.04 -0.07, and [Fe/H] = -0.28 ± 0.04, with an inferred mass M· = 1.09 ± 0.04M· and radius R· = 1.58+0.16 -0.09 R ·. The planetary companion has mass MP = 0.43 ± 0.05MJup, radius RP = 1.19+0.13 -0.08 RJup, surface gravity log gP = 2.86+0.06 -0.08, and density .P = 0.31+0.07 -0.08 g cm-3. The planet is on an orbit with semimajor axis a = 0.079 ± 0.001 AU and eccentricity e = 0.22+0.12 -0.10, which is roughly consistent with circular, and has ephemeris of Tc(BJDTDB) = 2456347.79679 ± 0.00036 and P = 7.845631 ± 0.000046 days. Equally plausible fits that employ empirical constraints on the host-star parameters rather than isochrones yield a larger planet mass and radius by ∼4}-7}. KELT-6b has surface gravity and incident flux similar to HD 209458b, but orbits a host that is more metal poor than HD 209458 by ∼0.3 dex. Thus, the KELT-6 system offers an opportunity to perform a comparative measurement of two similar planets in similar environments around stars of very different metallicities. The precise radial velocity data also reveal an acceleration indicative of a longer-period third body in the system, although the companion is not detected in Keck adaptive optics images.",
author = "Collins, {Karen A.} and Eastman, {Jason D.} and Thomas Beatty and Siverd, {Robert J.} and Gaudi, {B. Scott} and Joshua Pepper and Kielkopf, {John F.} and Johnson, {John Asher} and Howard, {Andrew W.} and Fischer, {Debra A.} and Mark Manner and Allyson Bieryla and Latham, {David W.} and Fulton, {Benjamin J.} and Joao Gregorio and Buchhave, {Lars A.} and Jensen, {Eric L.N.} and Stassun, {Keivan G.} and Kaloyan Penev and Crepp, {Justin R.} and Sasha Hinkley and Street, {Rachel A.} and Phillip Cargile and MacK, {Claude E.} and Oberst, {Thomas E.} and Avril, {Ryan L.} and Mellon, {Samuel N.} and McLeod, {Kim K.} and Penny, {Matthew T.} and Stefanik, {Robert P.} and Perry Berlind and Calkins, {Michael L.} and Qingqing Mao and Richert, {Alexander J.W.} and Depoy, {Darren L.} and Esquerdo, {Gilbert A.} and Andrew Gould and Marshall, {Jennifer L.} and Oelkers, {Ryan J.} and Pogge, {Richard W.} and Mark Trueblood and Patricia Trueblood",
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language = "English (US)",
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journal = "Astronomical Journal",
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Collins, KA, Eastman, JD, Beatty, T, Siverd, RJ, Gaudi, BS, Pepper, J, Kielkopf, JF, Johnson, JA, Howard, AW, Fischer, DA, Manner, M, Bieryla, A, Latham, DW, Fulton, BJ, Gregorio, J, Buchhave, LA, Jensen, ELN, Stassun, KG, Penev, K, Crepp, JR, Hinkley, S, Street, RA, Cargile, P, MacK, CE, Oberst, TE, Avril, RL, Mellon, SN, McLeod, KK, Penny, MT, Stefanik, RP, Berlind, P, Calkins, ML, Mao, Q, Richert, AJW, Depoy, DL, Esquerdo, GA, Gould, A, Marshall, JL, Oelkers, RJ, Pogge, RW, Trueblood, M & Trueblood, P 2014, 'KELT-6b: A P ∼ 7.9 day hot saturn transiting a metal-poor star with a long-period companion', Astronomical Journal, vol. 147, no. 2, 39. https://doi.org/10.1088/0004-6256/147/2/39

KELT-6b : A P ∼ 7.9 day hot saturn transiting a metal-poor star with a long-period companion. / Collins, Karen A.; Eastman, Jason D.; Beatty, Thomas; Siverd, Robert J.; Gaudi, B. Scott; Pepper, Joshua; Kielkopf, John F.; Johnson, John Asher; Howard, Andrew W.; Fischer, Debra A.; Manner, Mark; Bieryla, Allyson; Latham, David W.; Fulton, Benjamin J.; Gregorio, Joao; Buchhave, Lars A.; Jensen, Eric L.N.; Stassun, Keivan G.; Penev, Kaloyan; Crepp, Justin R.; Hinkley, Sasha; Street, Rachel A.; Cargile, Phillip; MacK, Claude E.; Oberst, Thomas E.; Avril, Ryan L.; Mellon, Samuel N.; McLeod, Kim K.; Penny, Matthew T.; Stefanik, Robert P.; Berlind, Perry; Calkins, Michael L.; Mao, Qingqing; Richert, Alexander J.W.; Depoy, Darren L.; Esquerdo, Gilbert A.; Gould, Andrew; Marshall, Jennifer L.; Oelkers, Ryan J.; Pogge, Richard W.; Trueblood, Mark; Trueblood, Patricia.

In: Astronomical Journal, Vol. 147, No. 2, 39, 01.02.2014.

Research output: Contribution to journalArticle

TY - JOUR

T1 - KELT-6b

T2 - A P ∼ 7.9 day hot saturn transiting a metal-poor star with a long-period companion

AU - Collins, Karen A.

AU - Eastman, Jason D.

AU - Beatty, Thomas

AU - Siverd, Robert J.

AU - Gaudi, B. Scott

AU - Pepper, Joshua

AU - Kielkopf, John F.

AU - Johnson, John Asher

AU - Howard, Andrew W.

AU - Fischer, Debra A.

AU - Manner, Mark

AU - Bieryla, Allyson

AU - Latham, David W.

AU - Fulton, Benjamin J.

AU - Gregorio, Joao

AU - Buchhave, Lars A.

AU - Jensen, Eric L.N.

AU - Stassun, Keivan G.

AU - Penev, Kaloyan

AU - Crepp, Justin R.

AU - Hinkley, Sasha

AU - Street, Rachel A.

AU - Cargile, Phillip

AU - MacK, Claude E.

AU - Oberst, Thomas E.

AU - Avril, Ryan L.

AU - Mellon, Samuel N.

AU - McLeod, Kim K.

AU - Penny, Matthew T.

AU - Stefanik, Robert P.

AU - Berlind, Perry

AU - Calkins, Michael L.

AU - Mao, Qingqing

AU - Richert, Alexander J.W.

AU - Depoy, Darren L.

AU - Esquerdo, Gilbert A.

AU - Gould, Andrew

AU - Marshall, Jennifer L.

AU - Oelkers, Ryan J.

AU - Pogge, Richard W.

AU - Trueblood, Mark

AU - Trueblood, Patricia

PY - 2014/2/1

Y1 - 2014/2/1

N2 - We report the discovery of KELT-6b, a mildly inflated Saturn-mass planet transiting a metal-poor host. The initial transit signal was identified in KELT-North survey data, and the planetary nature of the occulter was established using a combination of follow-up photometry, high-resolution imaging, high-resolution spectroscopy, and precise radial velocity measurements. The fiducial model from a global analysis including constraints from isochrones indicates that the V = 10.38 host star (BD+31 2447) is a mildly evolved, late-F star with T eff = 6102 ± 43 K, log g* = 4.07 +0.04 -0.07, and [Fe/H] = -0.28 ± 0.04, with an inferred mass M· = 1.09 ± 0.04M· and radius R· = 1.58+0.16 -0.09 R ·. The planetary companion has mass MP = 0.43 ± 0.05MJup, radius RP = 1.19+0.13 -0.08 RJup, surface gravity log gP = 2.86+0.06 -0.08, and density .P = 0.31+0.07 -0.08 g cm-3. The planet is on an orbit with semimajor axis a = 0.079 ± 0.001 AU and eccentricity e = 0.22+0.12 -0.10, which is roughly consistent with circular, and has ephemeris of Tc(BJDTDB) = 2456347.79679 ± 0.00036 and P = 7.845631 ± 0.000046 days. Equally plausible fits that employ empirical constraints on the host-star parameters rather than isochrones yield a larger planet mass and radius by ∼4}-7}. KELT-6b has surface gravity and incident flux similar to HD 209458b, but orbits a host that is more metal poor than HD 209458 by ∼0.3 dex. Thus, the KELT-6 system offers an opportunity to perform a comparative measurement of two similar planets in similar environments around stars of very different metallicities. The precise radial velocity data also reveal an acceleration indicative of a longer-period third body in the system, although the companion is not detected in Keck adaptive optics images.

AB - We report the discovery of KELT-6b, a mildly inflated Saturn-mass planet transiting a metal-poor host. The initial transit signal was identified in KELT-North survey data, and the planetary nature of the occulter was established using a combination of follow-up photometry, high-resolution imaging, high-resolution spectroscopy, and precise radial velocity measurements. The fiducial model from a global analysis including constraints from isochrones indicates that the V = 10.38 host star (BD+31 2447) is a mildly evolved, late-F star with T eff = 6102 ± 43 K, log g* = 4.07 +0.04 -0.07, and [Fe/H] = -0.28 ± 0.04, with an inferred mass M· = 1.09 ± 0.04M· and radius R· = 1.58+0.16 -0.09 R ·. The planetary companion has mass MP = 0.43 ± 0.05MJup, radius RP = 1.19+0.13 -0.08 RJup, surface gravity log gP = 2.86+0.06 -0.08, and density .P = 0.31+0.07 -0.08 g cm-3. The planet is on an orbit with semimajor axis a = 0.079 ± 0.001 AU and eccentricity e = 0.22+0.12 -0.10, which is roughly consistent with circular, and has ephemeris of Tc(BJDTDB) = 2456347.79679 ± 0.00036 and P = 7.845631 ± 0.000046 days. Equally plausible fits that employ empirical constraints on the host-star parameters rather than isochrones yield a larger planet mass and radius by ∼4}-7}. KELT-6b has surface gravity and incident flux similar to HD 209458b, but orbits a host that is more metal poor than HD 209458 by ∼0.3 dex. Thus, the KELT-6 system offers an opportunity to perform a comparative measurement of two similar planets in similar environments around stars of very different metallicities. The precise radial velocity data also reveal an acceleration indicative of a longer-period third body in the system, although the companion is not detected in Keck adaptive optics images.

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