KElt-18b

Puffy planet, hot host, probably perturbed

Kim K. McLeod, Joseph E. Rodriguez, Ryan J. Oelkers, Karen A. Collins, Allyson Bieryla, Benjamin J. Fulton, Keivan G. Stassun, B. Scott Gaudi, Kaloyan Penev, Daniel J. Stevens, Knicole D. Colón, Joshua Pepper, Norio Narita, Ryu Tsuguru, Akihiko Fukui, Phillip A. Reed, Bethany Tirrell, Tiffany Visgaitis, John F. Kielkopf, David H. Cohen & 37 others Eric L.N. Jensen, Joao Gregorio, Özgür Baştürk, Thomas E. Oberst, Casey Melton, Eliza M.R. Kempton, Andrew Baldrige, Y. Sunny Zhao, Roberto Zambelli, David W. Latham, Gilbert A. Esquerdo, Perry Berlind, Michael L. Calkins, Andrew W. Howard, Howard Isaacson, Lauren M. Weiss, Paul Benni, Thomas Beatty, Jason D. Eastman, Matthew T. Penny, Robert J. Siverd, Michael B. Lund, Jonathan Labadie-Bartz, G. Zhou, Ivan A. Curtis, Michael D. Joner, Mark Manner, Howard Relles, Gaetano Scarpetta, Denise C. Stephens, Chris Stockdale, T. G. Tan, D. L. Depoy, Jennifer L. Marshall, Richard W. Pogge, Mark Trueblood, Patricia Trueblood

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We report the discovery of KELT-18b, a transiting hot Jupiter in a 2.87-day orbit around the bright (V = 10.1), hot, F4V star BD+60 1538 (TYC 3865-1173-1). We present follow-up photometry, spectroscopy, and adaptive optics imaging that allow a detailed characterization of the system. Our preferred model fits yield a host stellar temperature of K and a mass of, situating it as one of only a handful of known transiting planets with hosts that are as hot, massive, and bright. The planet has a mass of, a radius of, and a density of, making it one of the most inflated planets known around a hot star. We argue that KELT-18b's high temperature and low surface gravity, which yield an estimated ∼600 km atmospheric scale height, combined with its hot, bright host, make it an excellent candidate for observations aimed at atmospheric characterization. We also present evidence for a bound stellar companion at a projected separation of ∼1100 au, and speculate that it may have contributed to the strong misalignment we suspect between KELT-18's spin axis and its planet's orbital axis. The inferior conjunction time is 2457542.524998 ± 0.000416 (BJDTDB) and the orbital period is 2.8717510 ± 0.0000029 days. We encourage Rossiter-McLaughlin measurements in the near future to confirm the suspected spin-orbit misalignment of this system.

Original languageEnglish (US)
Article number263
JournalAstronomical Journal
Volume153
Issue number6
DOIs
StatePublished - Jun 1 2017

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planets
planet
hot stars
misalignment
stellar temperature
optics
orbits
orbitals
conjunction
scale height
Jupiter (planet)
adaptive optics
Jupiter
photometry
spectroscopy
gravity
gravitation
radii
temperature

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

McLeod, K. K., Rodriguez, J. E., Oelkers, R. J., Collins, K. A., Bieryla, A., Fulton, B. J., ... Trueblood, P. (2017). KElt-18b: Puffy planet, hot host, probably perturbed. Astronomical Journal, 153(6), [263]. https://doi.org/10.3847/1538-3881/aa6d5d
McLeod, Kim K. ; Rodriguez, Joseph E. ; Oelkers, Ryan J. ; Collins, Karen A. ; Bieryla, Allyson ; Fulton, Benjamin J. ; Stassun, Keivan G. ; Gaudi, B. Scott ; Penev, Kaloyan ; Stevens, Daniel J. ; Colón, Knicole D. ; Pepper, Joshua ; Narita, Norio ; Tsuguru, Ryu ; Fukui, Akihiko ; Reed, Phillip A. ; Tirrell, Bethany ; Visgaitis, Tiffany ; Kielkopf, John F. ; Cohen, David H. ; Jensen, Eric L.N. ; Gregorio, Joao ; Baştürk, Özgür ; Oberst, Thomas E. ; Melton, Casey ; Kempton, Eliza M.R. ; Baldrige, Andrew ; Zhao, Y. Sunny ; Zambelli, Roberto ; Latham, David W. ; Esquerdo, Gilbert A. ; Berlind, Perry ; Calkins, Michael L. ; Howard, Andrew W. ; Isaacson, Howard ; Weiss, Lauren M. ; Benni, Paul ; Beatty, Thomas ; Eastman, Jason D. ; Penny, Matthew T. ; Siverd, Robert J. ; Lund, Michael B. ; Labadie-Bartz, Jonathan ; Zhou, G. ; Curtis, Ivan A. ; Joner, Michael D. ; Manner, Mark ; Relles, Howard ; Scarpetta, Gaetano ; Stephens, Denise C. ; Stockdale, Chris ; Tan, T. G. ; Depoy, D. L. ; Marshall, Jennifer L. ; Pogge, Richard W. ; Trueblood, Mark ; Trueblood, Patricia. / KElt-18b : Puffy planet, hot host, probably perturbed. In: Astronomical Journal. 2017 ; Vol. 153, No. 6.
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title = "KElt-18b: Puffy planet, hot host, probably perturbed",
abstract = "We report the discovery of KELT-18b, a transiting hot Jupiter in a 2.87-day orbit around the bright (V = 10.1), hot, F4V star BD+60 1538 (TYC 3865-1173-1). We present follow-up photometry, spectroscopy, and adaptive optics imaging that allow a detailed characterization of the system. Our preferred model fits yield a host stellar temperature of K and a mass of, situating it as one of only a handful of known transiting planets with hosts that are as hot, massive, and bright. The planet has a mass of, a radius of, and a density of, making it one of the most inflated planets known around a hot star. We argue that KELT-18b's high temperature and low surface gravity, which yield an estimated ∼600 km atmospheric scale height, combined with its hot, bright host, make it an excellent candidate for observations aimed at atmospheric characterization. We also present evidence for a bound stellar companion at a projected separation of ∼1100 au, and speculate that it may have contributed to the strong misalignment we suspect between KELT-18's spin axis and its planet's orbital axis. The inferior conjunction time is 2457542.524998 ± 0.000416 (BJDTDB) and the orbital period is 2.8717510 ± 0.0000029 days. We encourage Rossiter-McLaughlin measurements in the near future to confirm the suspected spin-orbit misalignment of this system.",
author = "McLeod, {Kim K.} and Rodriguez, {Joseph E.} and Oelkers, {Ryan J.} and Collins, {Karen A.} and Allyson Bieryla and Fulton, {Benjamin J.} and Stassun, {Keivan G.} and Gaudi, {B. Scott} and Kaloyan Penev and Stevens, {Daniel J.} and Col{\'o}n, {Knicole D.} and Joshua Pepper and Norio Narita and Ryu Tsuguru and Akihiko Fukui and Reed, {Phillip A.} and Bethany Tirrell and Tiffany Visgaitis and Kielkopf, {John F.} and Cohen, {David H.} and Jensen, {Eric L.N.} and Joao Gregorio and {\"O}zg{\"u}r Başt{\"u}rk and Oberst, {Thomas E.} and Casey Melton and Kempton, {Eliza M.R.} and Andrew Baldrige and Zhao, {Y. Sunny} and Roberto Zambelli and Latham, {David W.} and Esquerdo, {Gilbert A.} and Perry Berlind and Calkins, {Michael L.} and Howard, {Andrew W.} and Howard Isaacson and Weiss, {Lauren M.} and Paul Benni and Thomas Beatty and Eastman, {Jason D.} and Penny, {Matthew T.} and Siverd, {Robert J.} and Lund, {Michael B.} and Jonathan Labadie-Bartz and G. Zhou and Curtis, {Ivan A.} and Joner, {Michael D.} and Mark Manner and Howard Relles and Gaetano Scarpetta and Stephens, {Denise C.} and Chris Stockdale and Tan, {T. G.} and Depoy, {D. L.} and Marshall, {Jennifer L.} and Pogge, {Richard W.} and Mark Trueblood and Patricia Trueblood",
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McLeod, KK, Rodriguez, JE, Oelkers, RJ, Collins, KA, Bieryla, A, Fulton, BJ, Stassun, KG, Gaudi, BS, Penev, K, Stevens, DJ, Colón, KD, Pepper, J, Narita, N, Tsuguru, R, Fukui, A, Reed, PA, Tirrell, B, Visgaitis, T, Kielkopf, JF, Cohen, DH, Jensen, ELN, Gregorio, J, Baştürk, Ö, Oberst, TE, Melton, C, Kempton, EMR, Baldrige, A, Zhao, YS, Zambelli, R, Latham, DW, Esquerdo, GA, Berlind, P, Calkins, ML, Howard, AW, Isaacson, H, Weiss, LM, Benni, P, Beatty, T, Eastman, JD, Penny, MT, Siverd, RJ, Lund, MB, Labadie-Bartz, J, Zhou, G, Curtis, IA, Joner, MD, Manner, M, Relles, H, Scarpetta, G, Stephens, DC, Stockdale, C, Tan, TG, Depoy, DL, Marshall, JL, Pogge, RW, Trueblood, M & Trueblood, P 2017, 'KElt-18b: Puffy planet, hot host, probably perturbed', Astronomical Journal, vol. 153, no. 6, 263. https://doi.org/10.3847/1538-3881/aa6d5d

KElt-18b : Puffy planet, hot host, probably perturbed. / McLeod, Kim K.; Rodriguez, Joseph E.; Oelkers, Ryan J.; Collins, Karen A.; Bieryla, Allyson; Fulton, Benjamin J.; Stassun, Keivan G.; Gaudi, B. Scott; Penev, Kaloyan; Stevens, Daniel J.; Colón, Knicole D.; Pepper, Joshua; Narita, Norio; Tsuguru, Ryu; Fukui, Akihiko; Reed, Phillip A.; Tirrell, Bethany; Visgaitis, Tiffany; Kielkopf, John F.; Cohen, David H.; Jensen, Eric L.N.; Gregorio, Joao; Baştürk, Özgür; Oberst, Thomas E.; Melton, Casey; Kempton, Eliza M.R.; Baldrige, Andrew; Zhao, Y. Sunny; Zambelli, Roberto; Latham, David W.; Esquerdo, Gilbert A.; Berlind, Perry; Calkins, Michael L.; Howard, Andrew W.; Isaacson, Howard; Weiss, Lauren M.; Benni, Paul; Beatty, Thomas; Eastman, Jason D.; Penny, Matthew T.; Siverd, Robert J.; Lund, Michael B.; Labadie-Bartz, Jonathan; Zhou, G.; Curtis, Ivan A.; Joner, Michael D.; Manner, Mark; Relles, Howard; Scarpetta, Gaetano; Stephens, Denise C.; Stockdale, Chris; Tan, T. G.; Depoy, D. L.; Marshall, Jennifer L.; Pogge, Richard W.; Trueblood, Mark; Trueblood, Patricia.

In: Astronomical Journal, Vol. 153, No. 6, 263, 01.06.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - KElt-18b

T2 - Puffy planet, hot host, probably perturbed

AU - McLeod, Kim K.

AU - Rodriguez, Joseph E.

AU - Oelkers, Ryan J.

AU - Collins, Karen A.

AU - Bieryla, Allyson

AU - Fulton, Benjamin J.

AU - Stassun, Keivan G.

AU - Gaudi, B. Scott

AU - Penev, Kaloyan

AU - Stevens, Daniel J.

AU - Colón, Knicole D.

AU - Pepper, Joshua

AU - Narita, Norio

AU - Tsuguru, Ryu

AU - Fukui, Akihiko

AU - Reed, Phillip A.

AU - Tirrell, Bethany

AU - Visgaitis, Tiffany

AU - Kielkopf, John F.

AU - Cohen, David H.

AU - Jensen, Eric L.N.

AU - Gregorio, Joao

AU - Baştürk, Özgür

AU - Oberst, Thomas E.

AU - Melton, Casey

AU - Kempton, Eliza M.R.

AU - Baldrige, Andrew

AU - Zhao, Y. Sunny

AU - Zambelli, Roberto

AU - Latham, David W.

AU - Esquerdo, Gilbert A.

AU - Berlind, Perry

AU - Calkins, Michael L.

AU - Howard, Andrew W.

AU - Isaacson, Howard

AU - Weiss, Lauren M.

AU - Benni, Paul

AU - Beatty, Thomas

AU - Eastman, Jason D.

AU - Penny, Matthew T.

AU - Siverd, Robert J.

AU - Lund, Michael B.

AU - Labadie-Bartz, Jonathan

AU - Zhou, G.

AU - Curtis, Ivan A.

AU - Joner, Michael D.

AU - Manner, Mark

AU - Relles, Howard

AU - Scarpetta, Gaetano

AU - Stephens, Denise C.

AU - Stockdale, Chris

AU - Tan, T. G.

AU - Depoy, D. L.

AU - Marshall, Jennifer L.

AU - Pogge, Richard W.

AU - Trueblood, Mark

AU - Trueblood, Patricia

PY - 2017/6/1

Y1 - 2017/6/1

N2 - We report the discovery of KELT-18b, a transiting hot Jupiter in a 2.87-day orbit around the bright (V = 10.1), hot, F4V star BD+60 1538 (TYC 3865-1173-1). We present follow-up photometry, spectroscopy, and adaptive optics imaging that allow a detailed characterization of the system. Our preferred model fits yield a host stellar temperature of K and a mass of, situating it as one of only a handful of known transiting planets with hosts that are as hot, massive, and bright. The planet has a mass of, a radius of, and a density of, making it one of the most inflated planets known around a hot star. We argue that KELT-18b's high temperature and low surface gravity, which yield an estimated ∼600 km atmospheric scale height, combined with its hot, bright host, make it an excellent candidate for observations aimed at atmospheric characterization. We also present evidence for a bound stellar companion at a projected separation of ∼1100 au, and speculate that it may have contributed to the strong misalignment we suspect between KELT-18's spin axis and its planet's orbital axis. The inferior conjunction time is 2457542.524998 ± 0.000416 (BJDTDB) and the orbital period is 2.8717510 ± 0.0000029 days. We encourage Rossiter-McLaughlin measurements in the near future to confirm the suspected spin-orbit misalignment of this system.

AB - We report the discovery of KELT-18b, a transiting hot Jupiter in a 2.87-day orbit around the bright (V = 10.1), hot, F4V star BD+60 1538 (TYC 3865-1173-1). We present follow-up photometry, spectroscopy, and adaptive optics imaging that allow a detailed characterization of the system. Our preferred model fits yield a host stellar temperature of K and a mass of, situating it as one of only a handful of known transiting planets with hosts that are as hot, massive, and bright. The planet has a mass of, a radius of, and a density of, making it one of the most inflated planets known around a hot star. We argue that KELT-18b's high temperature and low surface gravity, which yield an estimated ∼600 km atmospheric scale height, combined with its hot, bright host, make it an excellent candidate for observations aimed at atmospheric characterization. We also present evidence for a bound stellar companion at a projected separation of ∼1100 au, and speculate that it may have contributed to the strong misalignment we suspect between KELT-18's spin axis and its planet's orbital axis. The inferior conjunction time is 2457542.524998 ± 0.000416 (BJDTDB) and the orbital period is 2.8717510 ± 0.0000029 days. We encourage Rossiter-McLaughlin measurements in the near future to confirm the suspected spin-orbit misalignment of this system.

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DO - 10.3847/1538-3881/aa6d5d

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JO - Astronomical Journal

JF - Astronomical Journal

SN - 0004-6256

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ER -

McLeod KK, Rodriguez JE, Oelkers RJ, Collins KA, Bieryla A, Fulton BJ et al. KElt-18b: Puffy planet, hot host, probably perturbed. Astronomical Journal. 2017 Jun 1;153(6). 263. https://doi.org/10.3847/1538-3881/aa6d5d