HATS-7b: A HOT SUPER NEPTUNE TRANSITING A QUIET K DWARF STAR

G. Bakos, K. Penev, D. Bayliss, J. D. Hartman, G. Zhou, R. Brahm, L. Mancini, M. De Val-Borro, W. Bhatti, A. Jordán, M. Rabus, N. Espinoza, Z. Csubry, A. W. Howard, B. J. Fulton, L. A. Buchhave, S. Ciceri, T. Henning, B. Schmidt, H. IsaacsonR. W. Noyes, G. W. Marcy, V. Suc, A. R. Howe, A. S. Burrows, J. Lázár, I. Papp, P. Sári

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We report the discovery by the HATSouth network of HATS-7b, a transiting Super-Neptune with a mass of 0.120 ± 0.012 MJ, a radius of 0.563-0.034 +0.046 RJ, and an orbital period of 3.1853 days. The host star is a moderately bright (V = 13.340 ± 0.010 mag, KS = 10.976 ± 0.026 mag) K dwarf star with a mass of 0.849 ± 0.027 M, a radius of 0.815-0.035 +0.049 R, and a metallicity of [Fe H] = +0.250 ± 0.080. The star is photometrically quiet to within the precision of the HATSouth measurements, has low RV jitter, and shows no evidence for chromospheric activity in its spectrum. HATS-7b is the second smallest radius planet discovered by a wide-field ground-based transit survey, and one of only a handful of Neptune-size planets with mass and radius determined to 10% precision. Theoretical modeling of HATS-7b yields a hydrogen-helium fraction of 18 ± 4% (rock-iron core and H2-He envelope), or 9 ± 4% (ice core and H2-He envelope), i.e., it has a composition broadly similar to that of Uranus and Neptune, and very different from that of Saturn, which has 75% of its mass in H2-He. Based on a sample of transiting exoplanets with accurately (J <Mp <0.18 MJ).

Original languageEnglish
Article number111
JournalAstrophysical Journal
Volume813
Issue number2
DOIs
Publication statusPublished - Nov 10 2015

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K stars
Neptune (planet)
Neptune
radii
planets
envelopes
planet
dwarf stars
stars
Uranus (planet)
Uranus
Saturn
extrasolar planets
transit
ice core
helium
metallicity
ice
hydrogen
rocks

Keywords

  • stars: individual (HATS-7)
  • techniques: photometric
  • techniques: radial velocities
  • techniques: spectroscopic

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Bakos, G., Penev, K., Bayliss, D., Hartman, J. D., Zhou, G., Brahm, R., ... Sári, P. (2015). HATS-7b: A HOT SUPER NEPTUNE TRANSITING A QUIET K DWARF STAR. Astrophysical Journal, 813(2), [111]. https://doi.org/10.1088/0004-637X/813/2/111

HATS-7b : A HOT SUPER NEPTUNE TRANSITING A QUIET K DWARF STAR. / Bakos, G.; Penev, K.; Bayliss, D.; Hartman, J. D.; Zhou, G.; Brahm, R.; Mancini, L.; De Val-Borro, M.; Bhatti, W.; Jordán, A.; Rabus, M.; Espinoza, N.; Csubry, Z.; Howard, A. W.; Fulton, B. J.; Buchhave, L. A.; Ciceri, S.; Henning, T.; Schmidt, B.; Isaacson, H.; Noyes, R. W.; Marcy, G. W.; Suc, V.; Howe, A. R.; Burrows, A. S.; Lázár, J.; Papp, I.; Sári, P.

In: Astrophysical Journal, Vol. 813, No. 2, 111, 10.11.2015.

Research output: Contribution to journalArticle

Bakos, G, Penev, K, Bayliss, D, Hartman, JD, Zhou, G, Brahm, R, Mancini, L, De Val-Borro, M, Bhatti, W, Jordán, A, Rabus, M, Espinoza, N, Csubry, Z, Howard, AW, Fulton, BJ, Buchhave, LA, Ciceri, S, Henning, T, Schmidt, B, Isaacson, H, Noyes, RW, Marcy, GW, Suc, V, Howe, AR, Burrows, AS, Lázár, J, Papp, I & Sári, P 2015, 'HATS-7b: A HOT SUPER NEPTUNE TRANSITING A QUIET K DWARF STAR', Astrophysical Journal, vol. 813, no. 2, 111. https://doi.org/10.1088/0004-637X/813/2/111
Bakos G, Penev K, Bayliss D, Hartman JD, Zhou G, Brahm R et al. HATS-7b: A HOT SUPER NEPTUNE TRANSITING A QUIET K DWARF STAR. Astrophysical Journal. 2015 Nov 10;813(2). 111. https://doi.org/10.1088/0004-637X/813/2/111
Bakos, G. ; Penev, K. ; Bayliss, D. ; Hartman, J. D. ; Zhou, G. ; Brahm, R. ; Mancini, L. ; De Val-Borro, M. ; Bhatti, W. ; Jordán, A. ; Rabus, M. ; Espinoza, N. ; Csubry, Z. ; Howard, A. W. ; Fulton, B. J. ; Buchhave, L. A. ; Ciceri, S. ; Henning, T. ; Schmidt, B. ; Isaacson, H. ; Noyes, R. W. ; Marcy, G. W. ; Suc, V. ; Howe, A. R. ; Burrows, A. S. ; Lázár, J. ; Papp, I. ; Sári, P. / HATS-7b : A HOT SUPER NEPTUNE TRANSITING A QUIET K DWARF STAR. In: Astrophysical Journal. 2015 ; Vol. 813, No. 2.
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AU - Bakos, G.

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AU - Hartman, J. D.

AU - Zhou, G.

AU - Brahm, R.

AU - Mancini, L.

AU - De Val-Borro, M.

AU - Bhatti, W.

AU - Jordán, A.

AU - Rabus, M.

AU - Espinoza, N.

AU - Csubry, Z.

AU - Howard, A. W.

AU - Fulton, B. J.

AU - Buchhave, L. A.

AU - Ciceri, S.

AU - Henning, T.

AU - Schmidt, B.

AU - Isaacson, H.

AU - Noyes, R. W.

AU - Marcy, G. W.

AU - Suc, V.

AU - Howe, A. R.

AU - Burrows, A. S.

AU - Lázár, J.

AU - Papp, I.

AU - Sári, P.

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N2 - We report the discovery by the HATSouth network of HATS-7b, a transiting Super-Neptune with a mass of 0.120 ± 0.012 MJ, a radius of 0.563-0.034 +0.046 RJ, and an orbital period of 3.1853 days. The host star is a moderately bright (V = 13.340 ± 0.010 mag, KS = 10.976 ± 0.026 mag) K dwarf star with a mass of 0.849 ± 0.027 M⊙, a radius of 0.815-0.035 +0.049 R⊙, and a metallicity of [Fe H] = +0.250 ± 0.080. The star is photometrically quiet to within the precision of the HATSouth measurements, has low RV jitter, and shows no evidence for chromospheric activity in its spectrum. HATS-7b is the second smallest radius planet discovered by a wide-field ground-based transit survey, and one of only a handful of Neptune-size planets with mass and radius determined to 10% precision. Theoretical modeling of HATS-7b yields a hydrogen-helium fraction of 18 ± 4% (rock-iron core and H2-He envelope), or 9 ± 4% (ice core and H2-He envelope), i.e., it has a composition broadly similar to that of Uranus and Neptune, and very different from that of Saturn, which has 75% of its mass in H2-He. Based on a sample of transiting exoplanets with accurately (J <Mp <0.18 MJ).

AB - We report the discovery by the HATSouth network of HATS-7b, a transiting Super-Neptune with a mass of 0.120 ± 0.012 MJ, a radius of 0.563-0.034 +0.046 RJ, and an orbital period of 3.1853 days. The host star is a moderately bright (V = 13.340 ± 0.010 mag, KS = 10.976 ± 0.026 mag) K dwarf star with a mass of 0.849 ± 0.027 M⊙, a radius of 0.815-0.035 +0.049 R⊙, and a metallicity of [Fe H] = +0.250 ± 0.080. The star is photometrically quiet to within the precision of the HATSouth measurements, has low RV jitter, and shows no evidence for chromospheric activity in its spectrum. HATS-7b is the second smallest radius planet discovered by a wide-field ground-based transit survey, and one of only a handful of Neptune-size planets with mass and radius determined to 10% precision. Theoretical modeling of HATS-7b yields a hydrogen-helium fraction of 18 ± 4% (rock-iron core and H2-He envelope), or 9 ± 4% (ice core and H2-He envelope), i.e., it has a composition broadly similar to that of Uranus and Neptune, and very different from that of Saturn, which has 75% of its mass in H2-He. Based on a sample of transiting exoplanets with accurately (J <Mp <0.18 MJ).

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KW - techniques: photometric

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KW - techniques: spectroscopic

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