KELT-12b: A P ∼ 5 day, Highly Inflated Hot Jupiter Transiting a Mildly Evolved Hot Star

Daniel J. Stevens; Karen A. Collins; B. Scott Gaudi; Thomas G. Beatty; Robert J. Siverd; Allyson Bieryla; Benjamin J. Fulton; Justin R. Crepp; Erica J. Gonzales; Carl T. Coker; Kaloyan Penev; Keivan G. Stassun; Eric L.N. Jensen; Andrew W. Howard; David W. Latham; Joseph E. Rodriguez; Roberto Zambelli; Valerio Bozza; Phillip A. Reed; Joao Gregorio; Lars A. Buchhave; Matthew T. Penny; Joshua Pepper; Perry Berlind; Sebastiano Calchi Novati; Michael L. Calkins; Giuseppe D'Ago; Jason D. Eastman; D. Bayliss; Knicole D. Colón; Ivan A. Curtis; D. L. DePoy; Gilbert A. Esquerdo; Andrew Gould; Michael D. Joner; John F. Kielkopf; Jonathan Labadie-Bartz; Michael B. Lund; Mark Manner; Jennifer L. Marshall; Kim K. McLeod; Thomas E. Oberst; Richard W. Pogge; Gaetano Scarpetta; Denise C. Stephens; Christopher Stockdale; T. G. Tan; Mark Trueblood; Patricia Trueblood

doi:10.3847/1538-3881/aa5ffb

KELT-12b: A P ∼ 5 day, Highly Inflated Hot Jupiter Transiting a Mildly Evolved Hot Star

Daniel J. Stevens, Karen A. Collins, B. Scott Gaudi, Thomas G. Beatty, Robert J. Siverd, Allyson Bieryla, Benjamin J. Fulton, Justin R. Crepp, Erica J. Gonzales, Carl T. Coker, Kaloyan Penev, Keivan G. Stassun, Eric L.N. Jensen, Andrew W. Howard, David W. Latham, Joseph E. Rodriguez, Roberto Zambelli, Valerio Bozza, Phillip A. Reed, Joao GregorioLars A. Buchhave, Matthew T. Penny, Joshua Pepper, Perry Berlind, Sebastiano Calchi Novati, Michael L. Calkins, Giuseppe D'Ago, Jason D. Eastman, D. Bayliss, Knicole D. Colón, Ivan A. Curtis, D. L. DePoy, Gilbert A. Esquerdo, Andrew Gould, Michael D. Joner, John F. Kielkopf, Jonathan Labadie-Bartz, Michael B. Lund, Mark Manner, Jennifer L. Marshall, Kim K. McLeod, Thomas E. Oberst, Richard W. Pogge, Gaetano Scarpetta, Denise C. Stephens, Christopher Stockdale, T. G. Tan, Mark Trueblood, Patricia Trueblood

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

We announce the discovery of KELT-12b, a highly inflated Jupiter-mass planet transiting the mildly evolved, V = 10.64 host star TYC 2619-1057-1. We followed up the initial transit signal in the KELT-North survey data with precise ground-based photometry, high-resolution spectroscopy, precise radial velocity measurements, and high-resolution adaptive optics imaging. Our preferred best-fit model indicates that the host star has = 6279 ±51 K, = 3.89 ±0.05, [Fe/H] = 0.19^+0.08 _-0.09, = M∗ = 1.59^+0.07 _0.09M, and R ∗= 2.37 ±0.17 . The planetary companion has M_p= 0.95 ±0.14 M_J, R_P = 1.78+^0.17_-0.16 R_J, log g_P = 2.87^+0.9 _-0.09 and density p_p 0.21^0.07 _0.05= g cm^-3, making it one of the most inflated giant planets known. Furthermore, for future follow-up, we report a high-precision time of inferior conjunction in BJD_TDB of 2,457,083.660459 ±0.000894 and period of P = 5.0316216 ± 0.000032days. Despite the relatively large separation of ∼0.07 au implied by its ∼5.03-day orbital period, KELT-12b receives significant flux of 2.38^+0.32 _-0.29 × 10⁹ erg s^-1 cm^-2 from its host. We compare the radii and insolations of transiting gas giant planets around hot (T_eff 6250 K) and cool stars, noting that the observed paucity of known transiting giants around hot stars with low insolation is likely due to selection effects. We underscore the significance of long-term ground-based monitoring of hot stars and space-based targeting of hot stars with the Transiting Exoplanet Survey Satellite to search for inflated gas giants in longer-period orbits.

Original language	English (US)
Article number	178
Journal	Astronomical Journal
Volume	153
Issue number	4
DOIs	https://doi.org/10.3847/1538-3881/aa5ffb
State	Published - Apr 2017
Externally published	Yes

Keywords

planets and satellites: individual (KELT-12b)
stars: individual (KELT-12, TYC 2619-1057-1)

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-3881/aa5ffb

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Stevens, D. J., Collins, K. A., Gaudi, B. S., Beatty, T. G., Siverd, R. J., Bieryla, A., Fulton, B. J., Crepp, J. R., Gonzales, E. J., Coker, C. T., Penev, K., Stassun, K. G., Jensen, E. L. N., Howard, A. W., Latham, D. W., Rodriguez, J. E., Zambelli, R., Bozza, V., Reed, P. A., ... Trueblood, P. (2017). KELT-12b: A P ∼ 5 day, Highly Inflated Hot Jupiter Transiting a Mildly Evolved Hot Star. Astronomical Journal, 153(4), Article 178. https://doi.org/10.3847/1538-3881/aa5ffb

Stevens, DJ, Collins, KA, Gaudi, BS, Beatty, TG, Siverd, RJ, Bieryla, A, Fulton, BJ, Crepp, JR, Gonzales, EJ, Coker, CT, Penev, K, Stassun, KG, Jensen, ELN, Howard, AW, Latham, DW, Rodriguez, JE, Zambelli, R, Bozza, V, Reed, PA, Gregorio, J, Buchhave, LA, Penny, MT, Pepper, J, Berlind, P, Novati, SC, Calkins, ML, D'Ago, G, Eastman, JD, Bayliss, D, Colón, KD, Curtis, IA, DePoy, DL, Esquerdo, GA, Gould, A, Joner, MD, Kielkopf, JF, Labadie-Bartz, J, Lund, MB, Manner, M, Marshall, JL, McLeod, KK, Oberst, TE, Pogge, RW, Scarpetta, G, Stephens, DC, Stockdale, C, Tan, TG, Trueblood, M & Trueblood, P 2017, 'KELT-12b: A P ∼ 5 day, Highly Inflated Hot Jupiter Transiting a Mildly Evolved Hot Star', Astronomical Journal, vol. 153, no. 4, 178. https://doi.org/10.3847/1538-3881/aa5ffb

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title = "KELT-12b: A P ∼ 5 day, Highly Inflated Hot Jupiter Transiting a Mildly Evolved Hot Star",

abstract = "We announce the discovery of KELT-12b, a highly inflated Jupiter-mass planet transiting the mildly evolved, V = 10.64 host star TYC 2619-1057-1. We followed up the initial transit signal in the KELT-North survey data with precise ground-based photometry, high-resolution spectroscopy, precise radial velocity measurements, and high-resolution adaptive optics imaging. Our preferred best-fit model indicates that the host star has = 6279 ±51 K, = 3.89 ±0.05, [Fe/H] = 0.19+0.08 -0.09, = M∗ = 1.59+0.07 0.09M, and R ∗= 2.37 ±0.17 . The planetary companion has Mp= 0.95 ±0.14 MJ, RP = 1.78+0.17-0.16 RJ, log gP = 2.87+0.9 -0.09 and density pp 0.210.07 0.05= g cm-3, making it one of the most inflated giant planets known. Furthermore, for future follow-up, we report a high-precision time of inferior conjunction in BJDTDB of 2,457,083.660459 ±0.000894 and period of P = 5.0316216 ± 0.000032days. Despite the relatively large separation of ∼0.07 au implied by its ∼5.03-day orbital period, KELT-12b receives significant flux of 2.38+0.32 -0.29 × 109 erg s-1 cm-2 from its host. We compare the radii and insolations of transiting gas giant planets around hot (Teff 6250 K) and cool stars, noting that the observed paucity of known transiting giants around hot stars with low insolation is likely due to selection effects. We underscore the significance of long-term ground-based monitoring of hot stars and space-based targeting of hot stars with the Transiting Exoplanet Survey Satellite to search for inflated gas giants in longer-period orbits.",

keywords = "planets and satellites: individual (KELT-12b), stars: individual (KELT-12, TYC 2619-1057-1)",

author = "Stevens, {Daniel J.} and Collins, {Karen A.} and Gaudi, {B. Scott} and Beatty, {Thomas G.} and Siverd, {Robert J.} and Allyson Bieryla and Fulton, {Benjamin J.} and Crepp, {Justin R.} and Gonzales, {Erica J.} and Coker, {Carl T.} and Kaloyan Penev and Stassun, {Keivan G.} and Jensen, {Eric L.N.} and Howard, {Andrew W.} and Latham, {David W.} and Rodriguez, {Joseph E.} and Roberto Zambelli and Valerio Bozza and Reed, {Phillip A.} and Joao Gregorio and Buchhave, {Lars A.} and Penny, {Matthew T.} and Joshua Pepper and Perry Berlind and Novati, {Sebastiano Calchi} and Calkins, {Michael L.} and Giuseppe D'Ago and Eastman, {Jason D.} and D. Bayliss and Col{\'o}n, {Knicole D.} and Curtis, {Ivan A.} and DePoy, {D. L.} and Esquerdo, {Gilbert A.} and Andrew Gould and Joner, {Michael D.} and Kielkopf, {John F.} and Jonathan Labadie-Bartz and Lund, {Michael B.} and Mark Manner and Marshall, {Jennifer L.} and McLeod, {Kim K.} and Oberst, {Thomas E.} and Pogge, {Richard W.} and Gaetano Scarpetta and Stephens, {Denise C.} and Christopher Stockdale and Tan, {T. G.} and Mark Trueblood and Patricia Trueblood",

year = "2017",

month = apr,

doi = "10.3847/1538-3881/aa5ffb",

language = "English (US)",

volume = "153",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "4",

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TY - JOUR

T1 - KELT-12b

T2 - A P ∼ 5 day, Highly Inflated Hot Jupiter Transiting a Mildly Evolved Hot Star

AU - Stevens, Daniel J.

AU - Collins, Karen A.

AU - Gaudi, B. Scott

AU - Beatty, Thomas G.

AU - Siverd, Robert J.

AU - Bieryla, Allyson

AU - Fulton, Benjamin J.

AU - Crepp, Justin R.

AU - Gonzales, Erica J.

AU - Coker, Carl T.

AU - Penev, Kaloyan

AU - Stassun, Keivan G.

AU - Jensen, Eric L.N.

AU - Howard, Andrew W.

AU - Latham, David W.

AU - Rodriguez, Joseph E.

AU - Zambelli, Roberto

AU - Bozza, Valerio

AU - Reed, Phillip A.

AU - Gregorio, Joao

AU - Buchhave, Lars A.

AU - Penny, Matthew T.

AU - Pepper, Joshua

AU - Berlind, Perry

AU - Novati, Sebastiano Calchi

AU - Calkins, Michael L.

AU - D'Ago, Giuseppe

AU - Eastman, Jason D.

AU - Bayliss, D.

AU - Colón, Knicole D.

AU - Curtis, Ivan A.

AU - DePoy, D. L.

AU - Esquerdo, Gilbert A.

AU - Gould, Andrew

AU - Joner, Michael D.

AU - Kielkopf, John F.

AU - Labadie-Bartz, Jonathan

AU - Lund, Michael B.

AU - Manner, Mark

AU - Marshall, Jennifer L.

AU - McLeod, Kim K.

AU - Oberst, Thomas E.

AU - Pogge, Richard W.

AU - Scarpetta, Gaetano

AU - Stephens, Denise C.

AU - Stockdale, Christopher

AU - Tan, T. G.

AU - Trueblood, Mark

AU - Trueblood, Patricia

PY - 2017/4

Y1 - 2017/4

N2 - We announce the discovery of KELT-12b, a highly inflated Jupiter-mass planet transiting the mildly evolved, V = 10.64 host star TYC 2619-1057-1. We followed up the initial transit signal in the KELT-North survey data with precise ground-based photometry, high-resolution spectroscopy, precise radial velocity measurements, and high-resolution adaptive optics imaging. Our preferred best-fit model indicates that the host star has = 6279 ±51 K, = 3.89 ±0.05, [Fe/H] = 0.19+0.08 -0.09, = M∗ = 1.59+0.07 0.09M, and R ∗= 2.37 ±0.17 . The planetary companion has Mp= 0.95 ±0.14 MJ, RP = 1.78+0.17-0.16 RJ, log gP = 2.87+0.9 -0.09 and density pp 0.210.07 0.05= g cm-3, making it one of the most inflated giant planets known. Furthermore, for future follow-up, we report a high-precision time of inferior conjunction in BJDTDB of 2,457,083.660459 ±0.000894 and period of P = 5.0316216 ± 0.000032days. Despite the relatively large separation of ∼0.07 au implied by its ∼5.03-day orbital period, KELT-12b receives significant flux of 2.38+0.32 -0.29 × 109 erg s-1 cm-2 from its host. We compare the radii and insolations of transiting gas giant planets around hot (Teff 6250 K) and cool stars, noting that the observed paucity of known transiting giants around hot stars with low insolation is likely due to selection effects. We underscore the significance of long-term ground-based monitoring of hot stars and space-based targeting of hot stars with the Transiting Exoplanet Survey Satellite to search for inflated gas giants in longer-period orbits.

AB - We announce the discovery of KELT-12b, a highly inflated Jupiter-mass planet transiting the mildly evolved, V = 10.64 host star TYC 2619-1057-1. We followed up the initial transit signal in the KELT-North survey data with precise ground-based photometry, high-resolution spectroscopy, precise radial velocity measurements, and high-resolution adaptive optics imaging. Our preferred best-fit model indicates that the host star has = 6279 ±51 K, = 3.89 ±0.05, [Fe/H] = 0.19+0.08 -0.09, = M∗ = 1.59+0.07 0.09M, and R ∗= 2.37 ±0.17 . The planetary companion has Mp= 0.95 ±0.14 MJ, RP = 1.78+0.17-0.16 RJ, log gP = 2.87+0.9 -0.09 and density pp 0.210.07 0.05= g cm-3, making it one of the most inflated giant planets known. Furthermore, for future follow-up, we report a high-precision time of inferior conjunction in BJDTDB of 2,457,083.660459 ±0.000894 and period of P = 5.0316216 ± 0.000032days. Despite the relatively large separation of ∼0.07 au implied by its ∼5.03-day orbital period, KELT-12b receives significant flux of 2.38+0.32 -0.29 × 109 erg s-1 cm-2 from its host. We compare the radii and insolations of transiting gas giant planets around hot (Teff 6250 K) and cool stars, noting that the observed paucity of known transiting giants around hot stars with low insolation is likely due to selection effects. We underscore the significance of long-term ground-based monitoring of hot stars and space-based targeting of hot stars with the Transiting Exoplanet Survey Satellite to search for inflated gas giants in longer-period orbits.

KW - planets and satellites: individual (KELT-12b)

KW - stars: individual (KELT-12, TYC 2619-1057-1)

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JO - Astronomical Journal

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ER -

KELT-12b: A P ∼ 5 day, Highly Inflated Hot Jupiter Transiting a Mildly Evolved Hot Star

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