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; 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 G. 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

doi:10.3847/1538-3881/aa6d5d

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. CohenEric 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 G. 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 journal › Article › peer-review

16 Scopus citations

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 (BJD_TDB) 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 language	English (US)
Article number	263
Journal	Astronomical Journal
Volume	153
Issue number	6
DOIs	https://doi.org/10.3847/1538-3881/aa6d5d
State	Published - Jun 2017
Externally published	Yes

Keywords

methods: observational
planets and satellites: detection
planets and satellites: gaseous planets
stars: individual (BD+60 1538)
techniques: photometric
techniques: radial velocities

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.3847/1538-3881/aa6d5d

Cite this

McLeod, K. K., Rodriguez, J. E., Oelkers, R. J., Collins, K. A., Bieryla, A., Fulton, B. J., Stassun, K. G., Gaudi, B. S., Penev, K., Stevens, D. J., Colón, K. D., Pepper, J., Narita, N., Tsuguru, R., Fukui, A., Reed, P. A., Tirrell, B., Visgaitis, T., Kielkopf, J. F., ... Trueblood, P. (2017). KElt-18b: Puffy planet, hot host, probably perturbed. Astronomical Journal, 153(6), Article 263. https://doi.org/10.3847/1538-3881/aa6d5d

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, TG, 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

@article{42de87d78c6643008f39ad9508d4cfdf,

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.",

keywords = "methods: observational, planets and satellites: detection, planets and satellites: gaseous planets, stars: individual (BD+60 1538), techniques: photometric, techniques: radial velocities",

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 Ba{\c s}t{\"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 Beatty, {Thomas G.} 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",

year = "2017",

month = jun,

doi = "10.3847/1538-3881/aa6d5d",

language = "English (US)",

volume = "153",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "6",

}

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 G.

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

Y1 - 2017/6

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.

KW - methods: observational

KW - planets and satellites: detection

KW - planets and satellites: gaseous planets

KW - stars: individual (BD+60 1538)

KW - techniques: photometric

KW - techniques: radial velocities

UR - http://www.scopus.com/inward/record.url?scp=85020897286&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85020897286&partnerID=8YFLogxK

U2 - 10.3847/1538-3881/aa6d5d

DO - 10.3847/1538-3881/aa6d5d

M3 - Article

AN - SCOPUS:85020897286

SN - 0004-6256

VL - 153

JO - Astronomical Journal

JF - Astronomical Journal

IS - 6

M1 - 263

ER -

KElt-18b: Puffy planet, hot host, probably perturbed

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this