KELT-20b: A Giant Planet with a Period of P ∼ 3.5 days Transiting the v ∼ 7.6 Early A Star HD 185603

Michael B. Lund, Joseph E. Rodriguez, George Zhou, B. Scott Gaudi, Keivan G. Stassun, Marshall C. Johnson, Allyson Bieryla, Ryan J. Oelkers, Daniel J. Stevens, Karen A. Collins, Kaloyan Penev, Samuel N. Quinn, David W. Latham, Steven Villanueva, Jason D. Eastman, John F. Kielkopf, Thomas E. Oberst, Eric L.N. Jensen, David H. Cohen, Michael D. JonerDenise C. Stephens, Howard Relles, Giorgio Corfini, Joao Gregorio, Roberto Zambelli, Gilbert A. Esquerdo, Michael L. Calkins, Perry Berlind, David R. Ciardi, Courtney Dressing, Rahul Patel, Patrick Gagnon, Erica Gonzales, Thomas G. Beatty, Robert J. Siverd, Jonathan Labadie-Bartz, Rudolf B. Kuhn, Knicole D. Colón, David James, Joshua Pepper, Benjamin J. Fulton, Kim K. McLeod, Christopher Stockdale, Sebastiano Calchi Novati, D. L. DePoy, Andrew Gould, Jennifer L. Marshall, Mark Trueblood, Patricia Trueblood, John A. Johnson, Jason Wright, Nate McCrady, Robert A. Wittenmyer, Samson A. Johnson, Anthony Sergi, Maurice Wilson, David H. Sliski

Research output: Contribution to journalArticle

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Abstract

We report the discovery of KELT-20b, a hot Jupiter transiting a V ∼7.6 early A star, HD 185603, with an orbital period of P ≃3.47 days. Archival and follow-up photometry, Gaia parallax, radial velocities, Doppler tomography, and AO imaging were used to confirm the planetary nature of KELT-20b and characterize the system. From global modeling we infer that KELT-20 is a rapidly rotating (v sin I∗ ≃ 120 km s-1 ) A2V star with an effective temperature of Teff=8730 -260 +250 K, mass of M∗+1.76-0.20 +0.14MO, radius of R∗= 1.561-0.064+0.058RO,surface gravity of log g ∗=4.292-0.020+0.017, and age of ≳600 Myr. The planetary companion has a radius of Rp=1.735 -0.075 +0.070Rj, a semimajor axis of a =0.0542-0.0021+0.0014 au, and a linear ephemeris of BJDTDB=2457503.120049 ± 0.000190+E(3.4741070± 0.0000019). We place a 3s upper limit of ∼ 3.5 MJ on the mass of the planet. Doppler tomographic measurements indicate that the planetary orbit normal is well aligned with the projected spin axis of the star (l = 3 °.4± 2 °.1). The inclination of the star is constrained to 24°.4 > I ∗ > 155 °.6, implying a three-dimensional spin-orbit alignment of 1°.3 > ψ > 69°.8. KELT-20b receives an insolation flux of∼8× 109 erg s-1cm-2, implying an equilibrium temperature of of ∼ 2250 K, assuming zero albedo and complete heat redistribution. Due to the high stellar Teff, KELT-20b also receives an ultraviolet (wavelength d ≤ 91.2 nm) insolation flux of ∼9.1×104erg s-1 cm-2, possibly indicating significant atmospheric ablation. Together with WASP-33, Kepler-13 A, HAT-P-57, KELT-17, and KELT-9, KELT-20 is the sixth A star host of a transiting giant planet, and the thirdbrightest host (in V) of a transiting planet.

Original languageEnglish (US)
Article number194
JournalAstronomical Journal
Volume154
Issue number5
DOIs
StatePublished - Nov 2017

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early stars
A stars
planets
insolation
planet
stars
planetary orbits
radii
parallax
albedo
Jupiter (planet)
ablation
Jupiter
radial velocity
erg
tomography
inclination
photometry
temperature
alignment

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Lund, M. B., Rodriguez, J. E., Zhou, G., Gaudi, B. S., Stassun, K. G., Johnson, M. C., ... Sliski, D. H. (2017). KELT-20b: A Giant Planet with a Period of P ∼ 3.5 days Transiting the v ∼ 7.6 Early A Star HD 185603. Astronomical Journal, 154(5), [194]. https://doi.org/10.3847/1538-3881/aa8f95
Lund, Michael B. ; Rodriguez, Joseph E. ; Zhou, George ; Gaudi, B. Scott ; Stassun, Keivan G. ; Johnson, Marshall C. ; Bieryla, Allyson ; Oelkers, Ryan J. ; Stevens, Daniel J. ; Collins, Karen A. ; Penev, Kaloyan ; Quinn, Samuel N. ; Latham, David W. ; Villanueva, Steven ; Eastman, Jason D. ; Kielkopf, John F. ; Oberst, Thomas E. ; Jensen, Eric L.N. ; Cohen, David H. ; Joner, Michael D. ; Stephens, Denise C. ; Relles, Howard ; Corfini, Giorgio ; Gregorio, Joao ; Zambelli, Roberto ; Esquerdo, Gilbert A. ; Calkins, Michael L. ; Berlind, Perry ; Ciardi, David R. ; Dressing, Courtney ; Patel, Rahul ; Gagnon, Patrick ; Gonzales, Erica ; Beatty, Thomas G. ; Siverd, Robert J. ; Labadie-Bartz, Jonathan ; Kuhn, Rudolf B. ; Colón, Knicole D. ; James, David ; Pepper, Joshua ; Fulton, Benjamin J. ; McLeod, Kim K. ; Stockdale, Christopher ; Calchi Novati, Sebastiano ; DePoy, D. L. ; Gould, Andrew ; Marshall, Jennifer L. ; Trueblood, Mark ; Trueblood, Patricia ; Johnson, John A. ; Wright, Jason ; McCrady, Nate ; Wittenmyer, Robert A. ; Johnson, Samson A. ; Sergi, Anthony ; Wilson, Maurice ; Sliski, David H. / KELT-20b : A Giant Planet with a Period of P ∼ 3.5 days Transiting the v ∼ 7.6 Early A Star HD 185603. In: Astronomical Journal. 2017 ; Vol. 154, No. 5.
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title = "KELT-20b: A Giant Planet with a Period of P ∼ 3.5 days Transiting the v ∼ 7.6 Early A Star HD 185603",
abstract = "We report the discovery of KELT-20b, a hot Jupiter transiting a V ∼7.6 early A star, HD 185603, with an orbital period of P ≃3.47 days. Archival and follow-up photometry, Gaia parallax, radial velocities, Doppler tomography, and AO imaging were used to confirm the planetary nature of KELT-20b and characterize the system. From global modeling we infer that KELT-20 is a rapidly rotating (v sin I∗ ≃ 120 km s-1 ) A2V star with an effective temperature of Teff=8730 -260 +250 K, mass of M∗+1.76-0.20 +0.14MO, radius of R∗= 1.561-0.064+0.058RO,surface gravity of log g ∗=4.292-0.020+0.017, and age of ≳600 Myr. The planetary companion has a radius of Rp=1.735 -0.075 +0.070Rj, a semimajor axis of a =0.0542-0.0021+0.0014 au, and a linear ephemeris of BJDTDB=2457503.120049 ± 0.000190+E(3.4741070± 0.0000019). We place a 3s upper limit of ∼ 3.5 MJ on the mass of the planet. Doppler tomographic measurements indicate that the planetary orbit normal is well aligned with the projected spin axis of the star (l = 3 °.4± 2 °.1). The inclination of the star is constrained to 24°.4 > I ∗ > 155 °.6, implying a three-dimensional spin-orbit alignment of 1°.3 > ψ > 69°.8. KELT-20b receives an insolation flux of∼8× 109 erg s-1cm-2, implying an equilibrium temperature of of ∼ 2250 K, assuming zero albedo and complete heat redistribution. Due to the high stellar Teff, KELT-20b also receives an ultraviolet (wavelength d ≤ 91.2 nm) insolation flux of ∼9.1×104erg s-1 cm-2, possibly indicating significant atmospheric ablation. Together with WASP-33, Kepler-13 A, HAT-P-57, KELT-17, and KELT-9, KELT-20 is the sixth A star host of a transiting giant planet, and the thirdbrightest host (in V) of a transiting planet.",
author = "Lund, {Michael B.} and Rodriguez, {Joseph E.} and George Zhou and Gaudi, {B. Scott} and Stassun, {Keivan G.} and Johnson, {Marshall C.} and Allyson Bieryla and Oelkers, {Ryan J.} and Stevens, {Daniel J.} and Collins, {Karen A.} and Kaloyan Penev and Quinn, {Samuel N.} and Latham, {David W.} and Steven Villanueva and Eastman, {Jason D.} and Kielkopf, {John F.} and Oberst, {Thomas E.} and Jensen, {Eric L.N.} and Cohen, {David H.} and Joner, {Michael D.} and Stephens, {Denise C.} and Howard Relles and Giorgio Corfini and Joao Gregorio and Roberto Zambelli and Esquerdo, {Gilbert A.} and Calkins, {Michael L.} and Perry Berlind and Ciardi, {David R.} and Courtney Dressing and Rahul Patel and Patrick Gagnon and Erica Gonzales and Beatty, {Thomas G.} and Siverd, {Robert J.} and Jonathan Labadie-Bartz and Kuhn, {Rudolf B.} and Col{\'o}n, {Knicole D.} and David James and Joshua Pepper and Fulton, {Benjamin J.} and McLeod, {Kim K.} and Christopher Stockdale and {Calchi Novati}, Sebastiano and DePoy, {D. L.} and Andrew Gould and Marshall, {Jennifer L.} and Mark Trueblood and Patricia Trueblood and Johnson, {John A.} and Jason Wright and Nate McCrady and Wittenmyer, {Robert A.} and Johnson, {Samson A.} and Anthony Sergi and Maurice Wilson and Sliski, {David H.}",
year = "2017",
month = "11",
doi = "10.3847/1538-3881/aa8f95",
language = "English (US)",
volume = "154",
journal = "Astronomical Journal",
issn = "0004-6256",
publisher = "IOP Publishing Ltd.",
number = "5",

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Lund, MB, Rodriguez, JE, Zhou, G, Gaudi, BS, Stassun, KG, Johnson, MC, Bieryla, A, Oelkers, RJ, Stevens, DJ, Collins, KA, Penev, K, Quinn, SN, Latham, DW, Villanueva, S, Eastman, JD, Kielkopf, JF, Oberst, TE, Jensen, ELN, Cohen, DH, Joner, MD, Stephens, DC, Relles, H, Corfini, G, Gregorio, J, Zambelli, R, Esquerdo, GA, Calkins, ML, Berlind, P, Ciardi, DR, Dressing, C, Patel, R, Gagnon, P, Gonzales, E, Beatty, TG, Siverd, RJ, Labadie-Bartz, J, Kuhn, RB, Colón, KD, James, D, Pepper, J, Fulton, BJ, McLeod, KK, Stockdale, C, Calchi Novati, S, DePoy, DL, Gould, A, Marshall, JL, Trueblood, M, Trueblood, P, Johnson, JA, Wright, J, McCrady, N, Wittenmyer, RA, Johnson, SA, Sergi, A, Wilson, M & Sliski, DH 2017, 'KELT-20b: A Giant Planet with a Period of P ∼ 3.5 days Transiting the v ∼ 7.6 Early A Star HD 185603', Astronomical Journal, vol. 154, no. 5, 194. https://doi.org/10.3847/1538-3881/aa8f95

KELT-20b : A Giant Planet with a Period of P ∼ 3.5 days Transiting the v ∼ 7.6 Early A Star HD 185603. / Lund, Michael B.; Rodriguez, Joseph E.; Zhou, George; Gaudi, B. Scott; Stassun, Keivan G.; Johnson, Marshall C.; Bieryla, Allyson; Oelkers, Ryan J.; Stevens, Daniel J.; Collins, Karen A.; Penev, Kaloyan; Quinn, Samuel N.; Latham, David W.; Villanueva, Steven; Eastman, Jason D.; Kielkopf, John F.; Oberst, Thomas E.; Jensen, Eric L.N.; Cohen, David H.; Joner, Michael D.; Stephens, Denise C.; Relles, Howard; Corfini, Giorgio; Gregorio, Joao; Zambelli, Roberto; Esquerdo, Gilbert A.; Calkins, Michael L.; Berlind, Perry; Ciardi, David R.; Dressing, Courtney; Patel, Rahul; Gagnon, Patrick; Gonzales, Erica; Beatty, Thomas G.; Siverd, Robert J.; Labadie-Bartz, Jonathan; Kuhn, Rudolf B.; Colón, Knicole D.; James, David; Pepper, Joshua; Fulton, Benjamin J.; McLeod, Kim K.; Stockdale, Christopher; Calchi Novati, Sebastiano; DePoy, D. L.; Gould, Andrew; Marshall, Jennifer L.; Trueblood, Mark; Trueblood, Patricia; Johnson, John A.; Wright, Jason; McCrady, Nate; Wittenmyer, Robert A.; Johnson, Samson A.; Sergi, Anthony; Wilson, Maurice; Sliski, David H.

In: Astronomical Journal, Vol. 154, No. 5, 194, 11.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - KELT-20b

T2 - A Giant Planet with a Period of P ∼ 3.5 days Transiting the v ∼ 7.6 Early A Star HD 185603

AU - Lund, Michael B.

AU - Rodriguez, Joseph E.

AU - Zhou, George

AU - Gaudi, B. Scott

AU - Stassun, Keivan G.

AU - Johnson, Marshall C.

AU - Bieryla, Allyson

AU - Oelkers, Ryan J.

AU - Stevens, Daniel J.

AU - Collins, Karen A.

AU - Penev, Kaloyan

AU - Quinn, Samuel N.

AU - Latham, David W.

AU - Villanueva, Steven

AU - Eastman, Jason D.

AU - Kielkopf, John F.

AU - Oberst, Thomas E.

AU - Jensen, Eric L.N.

AU - Cohen, David H.

AU - Joner, Michael D.

AU - Stephens, Denise C.

AU - Relles, Howard

AU - Corfini, Giorgio

AU - Gregorio, Joao

AU - Zambelli, Roberto

AU - Esquerdo, Gilbert A.

AU - Calkins, Michael L.

AU - Berlind, Perry

AU - Ciardi, David R.

AU - Dressing, Courtney

AU - Patel, Rahul

AU - Gagnon, Patrick

AU - Gonzales, Erica

AU - Beatty, Thomas G.

AU - Siverd, Robert J.

AU - Labadie-Bartz, Jonathan

AU - Kuhn, Rudolf B.

AU - Colón, Knicole D.

AU - James, David

AU - Pepper, Joshua

AU - Fulton, Benjamin J.

AU - McLeod, Kim K.

AU - Stockdale, Christopher

AU - Calchi Novati, Sebastiano

AU - DePoy, D. L.

AU - Gould, Andrew

AU - Marshall, Jennifer L.

AU - Trueblood, Mark

AU - Trueblood, Patricia

AU - Johnson, John A.

AU - Wright, Jason

AU - McCrady, Nate

AU - Wittenmyer, Robert A.

AU - Johnson, Samson A.

AU - Sergi, Anthony

AU - Wilson, Maurice

AU - Sliski, David H.

PY - 2017/11

Y1 - 2017/11

N2 - We report the discovery of KELT-20b, a hot Jupiter transiting a V ∼7.6 early A star, HD 185603, with an orbital period of P ≃3.47 days. Archival and follow-up photometry, Gaia parallax, radial velocities, Doppler tomography, and AO imaging were used to confirm the planetary nature of KELT-20b and characterize the system. From global modeling we infer that KELT-20 is a rapidly rotating (v sin I∗ ≃ 120 km s-1 ) A2V star with an effective temperature of Teff=8730 -260 +250 K, mass of M∗+1.76-0.20 +0.14MO, radius of R∗= 1.561-0.064+0.058RO,surface gravity of log g ∗=4.292-0.020+0.017, and age of ≳600 Myr. The planetary companion has a radius of Rp=1.735 -0.075 +0.070Rj, a semimajor axis of a =0.0542-0.0021+0.0014 au, and a linear ephemeris of BJDTDB=2457503.120049 ± 0.000190+E(3.4741070± 0.0000019). We place a 3s upper limit of ∼ 3.5 MJ on the mass of the planet. Doppler tomographic measurements indicate that the planetary orbit normal is well aligned with the projected spin axis of the star (l = 3 °.4± 2 °.1). The inclination of the star is constrained to 24°.4 > I ∗ > 155 °.6, implying a three-dimensional spin-orbit alignment of 1°.3 > ψ > 69°.8. KELT-20b receives an insolation flux of∼8× 109 erg s-1cm-2, implying an equilibrium temperature of of ∼ 2250 K, assuming zero albedo and complete heat redistribution. Due to the high stellar Teff, KELT-20b also receives an ultraviolet (wavelength d ≤ 91.2 nm) insolation flux of ∼9.1×104erg s-1 cm-2, possibly indicating significant atmospheric ablation. Together with WASP-33, Kepler-13 A, HAT-P-57, KELT-17, and KELT-9, KELT-20 is the sixth A star host of a transiting giant planet, and the thirdbrightest host (in V) of a transiting planet.

AB - We report the discovery of KELT-20b, a hot Jupiter transiting a V ∼7.6 early A star, HD 185603, with an orbital period of P ≃3.47 days. Archival and follow-up photometry, Gaia parallax, radial velocities, Doppler tomography, and AO imaging were used to confirm the planetary nature of KELT-20b and characterize the system. From global modeling we infer that KELT-20 is a rapidly rotating (v sin I∗ ≃ 120 km s-1 ) A2V star with an effective temperature of Teff=8730 -260 +250 K, mass of M∗+1.76-0.20 +0.14MO, radius of R∗= 1.561-0.064+0.058RO,surface gravity of log g ∗=4.292-0.020+0.017, and age of ≳600 Myr. The planetary companion has a radius of Rp=1.735 -0.075 +0.070Rj, a semimajor axis of a =0.0542-0.0021+0.0014 au, and a linear ephemeris of BJDTDB=2457503.120049 ± 0.000190+E(3.4741070± 0.0000019). We place a 3s upper limit of ∼ 3.5 MJ on the mass of the planet. Doppler tomographic measurements indicate that the planetary orbit normal is well aligned with the projected spin axis of the star (l = 3 °.4± 2 °.1). The inclination of the star is constrained to 24°.4 > I ∗ > 155 °.6, implying a three-dimensional spin-orbit alignment of 1°.3 > ψ > 69°.8. KELT-20b receives an insolation flux of∼8× 109 erg s-1cm-2, implying an equilibrium temperature of of ∼ 2250 K, assuming zero albedo and complete heat redistribution. Due to the high stellar Teff, KELT-20b also receives an ultraviolet (wavelength d ≤ 91.2 nm) insolation flux of ∼9.1×104erg s-1 cm-2, possibly indicating significant atmospheric ablation. Together with WASP-33, Kepler-13 A, HAT-P-57, KELT-17, and KELT-9, KELT-20 is the sixth A star host of a transiting giant planet, and the thirdbrightest host (in V) of a transiting planet.

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