KELT-11b: A Highly Inflated Sub-Saturn Exoplanet Transiting the v = 8 Subgiant HD 93396

Joshua Pepper; Joseph E. Rodriguez; Karen A. Collins; John Asher Johnson; Benjamin J. Fulton; Andrew W. Howard; Thomas G. Beatty; Keivan G. Stassun; Howard Isaacson; Knicole D. Colón; Michael B. Lund; Rudolf B. Kuhn; Robert J. Siverd; B. Scott Gaudi; T. G. Tan; Ivan Curtis; Christopher Stockdale; Dimitri Mawet; Michael Bottom; David James; George Zhou; Daniel Bayliss; Phillip Cargile; Allyson Bieryla; Kaloyan Penev; David W. Latham; Jonathan Labadie-Bartz; John Kielkopf; Jason D. Eastman; Thomas E. Oberst; Eric L.N. Jensen; Peter Nelson; David H. Sliski; Robert A. Wittenmyer; Nate McCrady; Jason T. Wright; Howard M. Relles; Daniel J. Stevens; Michael D. Joner; Eric Hintz

doi:10.3847/1538-3881/aa6572

KELT-11b: A Highly Inflated Sub-Saturn Exoplanet Transiting the v = 8 Subgiant HD 93396

Joshua Pepper, Joseph E. Rodriguez, Karen A. Collins, John Asher Johnson, Benjamin J. Fulton, Andrew W. Howard, Thomas G. Beatty, Keivan G. Stassun, Howard Isaacson, Knicole D. Colón, Michael B. Lund, Rudolf B. Kuhn, Robert J. Siverd, B. Scott Gaudi, T. G. Tan, Ivan Curtis, Christopher Stockdale, Dimitri Mawet, Michael Bottom, David JamesGeorge Zhou, Daniel Bayliss, Phillip Cargile, Allyson Bieryla, Kaloyan Penev, David W. Latham, Jonathan Labadie-Bartz, John Kielkopf, Jason D. Eastman, Thomas E. Oberst, Eric L.N. Jensen, Peter Nelson, David H. Sliski, Robert A. Wittenmyer, Nate McCrady, Jason T. Wright, Howard M. Relles, Daniel J. Stevens, Michael D. Joner, Eric Hintz

Physics and Astronomy

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Abstract

We report the discovery of a transiting exoplanet, KELT-11b, orbiting the bright (V = 8.0) subgiant HD 93396. A global analysis of the system shows that the host star is an evolved subgiant star with T_eff = 5370 ± 51K M&z.ast; = 1.438_-0.052 ^+0.061 &_. R∗ =2.72 _-0.21 ^+0.17 R_. log g∗ = 3.727 _-0.046 ^+0.040 and [fe/H] = 0.180 ± 0.075. The planet is a low-mass gas giant in a P = 4.736529 ±0.00006 day orbit, with M _P = 0.195 ±0.018 M_J R_P = 1.37 _0.12 ^0.15R_Jp_P = 0.093 _-0.024 ^+0.028g cm^-3, surface gravity log G_P 2.407_-0.086 ^+0.080, and equilibrium temperature T_eq = _-46 ⁺⁵¹K. KELT-11 is the brightest known transiting exoplanet host in the southern hemisphere by more than a magnitude and is the sixth brightest transit host to date. The planet is one of the most inflated planets known, with an exceptionally large atmospheric scale height (2763 km), and an associated size of the expected atmospheric transmission signal of 5.6%. These attributes make the KELT-11 system a valuable target for follow-up and atmospheric characterization, and it promises to become one of the benchmark systems for the study of inflated exoplanets.

Original language	English
Article number	215
Journal	Astronomical Journal
Volume	153
Issue number	5
DOIs	https://doi.org/10.3847/1538-3881/aa6572
State	Published - May 2017

Keywords

planetary systems
planets and satellites: detection
stars: individual (KELT-11)
techniques: photometric
techniques: radial velocities

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Pepper, J., Rodriguez, J. E., Collins, K. A., Johnson, J. A., Fulton, B. J., Howard, A. W., Beatty, T. G., Stassun, K. G., Isaacson, H., Colón, K. D., Lund, M. B., Kuhn, R. B., Siverd, R. J., Gaudi, B. S., Tan, T. G., Curtis, I., Stockdale, C., Mawet, D., Bottom, M., ... Hintz, E. (2017). KELT-11b: A Highly Inflated Sub-Saturn Exoplanet Transiting the v = 8 Subgiant HD 93396. Astronomical Journal, 153(5), Article 215. https://doi.org/10.3847/1538-3881/aa6572

@article{2d2a2a9baf7840308bb8cccc7befa935,

title = "KELT-11b: A Highly Inflated Sub-Saturn Exoplanet Transiting the v = 8 Subgiant HD 93396",

abstract = "We report the discovery of a transiting exoplanet, KELT-11b, orbiting the bright (V = 8.0) subgiant HD 93396. A global analysis of the system shows that the host star is an evolved subgiant star with Teff = 5370 ± 51K M&z.ast; = 1.438-0.052 +0.061 &. R∗ =2.72 -0.21 +0.17 R. log g∗ = 3.727 -0.046 +0.040 and [fe/H] = 0.180 ± 0.075. The planet is a low-mass gas giant in a P = 4.736529 ±0.00006 day orbit, with M P = 0.195 ±0.018 MJ RP = 1.37 0.12 0.15RJpP = 0.093 -0.024 +0.028g cm-3, surface gravity log GP 2.407-0.086 +0.080, and equilibrium temperature Teq = -46 +51K. KELT-11 is the brightest known transiting exoplanet host in the southern hemisphere by more than a magnitude and is the sixth brightest transit host to date. The planet is one of the most inflated planets known, with an exceptionally large atmospheric scale height (2763 km), and an associated size of the expected atmospheric transmission signal of 5.6%. These attributes make the KELT-11 system a valuable target for follow-up and atmospheric characterization, and it promises to become one of the benchmark systems for the study of inflated exoplanets.",

keywords = "planetary systems, planets and satellites: detection, stars: individual (KELT-11), techniques: photometric, techniques: radial velocities",

author = "Joshua Pepper and Rodriguez, {Joseph E.} and Collins, {Karen A.} and Johnson, {John Asher} and Fulton, {Benjamin J.} and Howard, {Andrew W.} and Beatty, {Thomas G.} and Stassun, {Keivan G.} and Howard Isaacson and Col{\'o}n, {Knicole D.} and Lund, {Michael B.} and Kuhn, {Rudolf B.} and Siverd, {Robert J.} and Gaudi, {B. Scott} and Tan, {T. G.} and Ivan Curtis and Christopher Stockdale and Dimitri Mawet and Michael Bottom and David James and George Zhou and Daniel Bayliss and Phillip Cargile and Allyson Bieryla and Kaloyan Penev and Latham, {David W.} and Jonathan Labadie-Bartz and John Kielkopf and Eastman, {Jason D.} and Oberst, {Thomas E.} and Jensen, {Eric L.N.} and Peter Nelson and Sliski, {David H.} and Wittenmyer, {Robert A.} and Nate McCrady and Wright, {Jason T.} and Relles, {Howard M.} and Stevens, {Daniel J.} and Joner, {Michael D.} and Eric Hintz",

year = "2017",

month = may,

doi = "10.3847/1538-3881/aa6572",

language = "English",

volume = "153",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "5",

}

Pepper, J, Rodriguez, JE, Collins, KA, Johnson, JA, Fulton, BJ, Howard, AW, Beatty, TG, Stassun, KG, Isaacson, H, Colón, KD, Lund, MB, Kuhn, RB, Siverd, RJ, Gaudi, BS, Tan, TG, Curtis, I, Stockdale, C, Mawet, D, Bottom, M, James, D, Zhou, G, Bayliss, D, Cargile, P, Bieryla, A, Penev, K, Latham, DW, Labadie-Bartz, J, Kielkopf, J, Eastman, JD, Oberst, TE, Jensen, ELN, Nelson, P, Sliski, DH, Wittenmyer, RA, McCrady, N, Wright, JT, Relles, HM, Stevens, DJ, Joner, MD & Hintz, E 2017, 'KELT-11b: A Highly Inflated Sub-Saturn Exoplanet Transiting the v = 8 Subgiant HD 93396', Astronomical Journal, vol. 153, no. 5, 215. https://doi.org/10.3847/1538-3881/aa6572

TY - JOUR

T1 - KELT-11b

T2 - A Highly Inflated Sub-Saturn Exoplanet Transiting the v = 8 Subgiant HD 93396

AU - Pepper, Joshua

AU - Rodriguez, Joseph E.

AU - Collins, Karen A.

AU - Johnson, John Asher

AU - Fulton, Benjamin J.

AU - Howard, Andrew W.

AU - Beatty, Thomas G.

AU - Stassun, Keivan G.

AU - Isaacson, Howard

AU - Colón, Knicole D.

AU - Lund, Michael B.

AU - Kuhn, Rudolf B.

AU - Siverd, Robert J.

AU - Gaudi, B. Scott

AU - Tan, T. G.

AU - Curtis, Ivan

AU - Stockdale, Christopher

AU - Mawet, Dimitri

AU - Bottom, Michael

AU - James, David

AU - Zhou, George

AU - Bayliss, Daniel

AU - Cargile, Phillip

AU - Bieryla, Allyson

AU - Penev, Kaloyan

AU - Latham, David W.

AU - Labadie-Bartz, Jonathan

AU - Kielkopf, John

AU - Eastman, Jason D.

AU - Oberst, Thomas E.

AU - Jensen, Eric L.N.

AU - Nelson, Peter

AU - Sliski, David H.

AU - Wittenmyer, Robert A.

AU - McCrady, Nate

AU - Wright, Jason T.

AU - Relles, Howard M.

AU - Stevens, Daniel J.

AU - Joner, Michael D.

AU - Hintz, Eric

PY - 2017/5

Y1 - 2017/5

N2 - We report the discovery of a transiting exoplanet, KELT-11b, orbiting the bright (V = 8.0) subgiant HD 93396. A global analysis of the system shows that the host star is an evolved subgiant star with Teff = 5370 ± 51K M&z.ast; = 1.438-0.052 +0.061 &. R∗ =2.72 -0.21 +0.17 R. log g∗ = 3.727 -0.046 +0.040 and [fe/H] = 0.180 ± 0.075. The planet is a low-mass gas giant in a P = 4.736529 ±0.00006 day orbit, with M P = 0.195 ±0.018 MJ RP = 1.37 0.12 0.15RJpP = 0.093 -0.024 +0.028g cm-3, surface gravity log GP 2.407-0.086 +0.080, and equilibrium temperature Teq = -46 +51K. KELT-11 is the brightest known transiting exoplanet host in the southern hemisphere by more than a magnitude and is the sixth brightest transit host to date. The planet is one of the most inflated planets known, with an exceptionally large atmospheric scale height (2763 km), and an associated size of the expected atmospheric transmission signal of 5.6%. These attributes make the KELT-11 system a valuable target for follow-up and atmospheric characterization, and it promises to become one of the benchmark systems for the study of inflated exoplanets.

AB - We report the discovery of a transiting exoplanet, KELT-11b, orbiting the bright (V = 8.0) subgiant HD 93396. A global analysis of the system shows that the host star is an evolved subgiant star with Teff = 5370 ± 51K M&z.ast; = 1.438-0.052 +0.061 &. R∗ =2.72 -0.21 +0.17 R. log g∗ = 3.727 -0.046 +0.040 and [fe/H] = 0.180 ± 0.075. The planet is a low-mass gas giant in a P = 4.736529 ±0.00006 day orbit, with M P = 0.195 ±0.018 MJ RP = 1.37 0.12 0.15RJpP = 0.093 -0.024 +0.028g cm-3, surface gravity log GP 2.407-0.086 +0.080, and equilibrium temperature Teq = -46 +51K. KELT-11 is the brightest known transiting exoplanet host in the southern hemisphere by more than a magnitude and is the sixth brightest transit host to date. The planet is one of the most inflated planets known, with an exceptionally large atmospheric scale height (2763 km), and an associated size of the expected atmospheric transmission signal of 5.6%. These attributes make the KELT-11 system a valuable target for follow-up and atmospheric characterization, and it promises to become one of the benchmark systems for the study of inflated exoplanets.

KW - planetary systems

KW - planets and satellites: detection

KW - stars: individual (KELT-11)

KW - techniques: photometric

KW - techniques: radial velocities

UR - http://www.scopus.com/inward/record.url?scp=85019045984&partnerID=8YFLogxK

U2 - 10.3847/1538-3881/aa6572

DO - 10.3847/1538-3881/aa6572

M3 - Article

AN - SCOPUS:85019045984

SN - 0004-6256

VL - 153

JO - Astronomical Journal

JF - Astronomical Journal

IS - 5

M1 - 215

ER -

KELT-11b: A Highly Inflated Sub-Saturn Exoplanet Transiting the v = 8 Subgiant HD 93396

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