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Title: HATS-4b: A dense hot Jupiter transiting a super metal-rich G star

Abstract

We report the discovery by the HATSouth survey of HATS-4b, an extrasolar planet transiting a V = 13.46 mag G star. HATS-4b has a period of P ≈ 2.5167 days, mass of M{sub p} ≈ 1.32 M {sub Jup}, radius of R{sub p} ≈ 1.02 R {sub Jup}, and density of ρ {sub p} = 1.55 ± 0.16 g cm{sup –3} ≈1.24 ρ{sub Jup}. The host star has a mass of 1.00 M {sub ☉}, a radius of 0.92 R {sub ☉}, and a very high metallicity [Fe/H]=0.43 ± 0.08. HATS-4b is among the densest known planets with masses between 1 and 2 M {sub J} and is thus likely to have a significant content of heavy elements of the order of 75 M {sub ⊕}. In this paper we present the data reduction, radial velocity measurements, and stellar classification techniques adopted by the HATSouth survey for the CORALIE spectrograph. We also detail a technique for simultaneously estimating vsin i and macroturbulence using high resolution spectra.

Authors:
; ; ; ;  [1]; ; ; ; ; ;  [2]; ;  [3]; ; ; ; ;  [4];  [5];  [6] more »; « less
  1. Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago (Chile)
  2. Department of Astrophysical Sciences, Princeton University, NJ 08544 (United States)
  3. The Australian National University, Canberra (Australia)
  4. Max Planck Institute for Astronomy, Heidelberg (Germany)
  5. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551 (Japan)
  6. Niels Bohr Institute, Copenhagen University (Denmark)
Publication Date:
OSTI Identifier:
22342287
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 148; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CLASSIFICATION; JUPITER PLANET; MASS; METALLICITY; METALS; RADIAL VELOCITY; REDUCTION; RESOLUTION; SPECTRA; STARS

Citation Formats

Jordán, Andrés, Brahm, Rafael, Rabus, M., Suc, V., Espinoza, N., Bakos, G. Á., Penev, K., Hartman, J. D., Csubry, Z., Bhatti, W., De Val Borro, M., Bayliss, D., Zhou, G., Mancini, L., Mohler-Fischer, M., Ciceri, S., Csák, B., Henning, T., Sato, B., Buchhave, L., and and others. HATS-4b: A dense hot Jupiter transiting a super metal-rich G star. United States: N. p., 2014. Web. doi:10.1088/0004-6256/148/2/29.
Jordán, Andrés, Brahm, Rafael, Rabus, M., Suc, V., Espinoza, N., Bakos, G. Á., Penev, K., Hartman, J. D., Csubry, Z., Bhatti, W., De Val Borro, M., Bayliss, D., Zhou, G., Mancini, L., Mohler-Fischer, M., Ciceri, S., Csák, B., Henning, T., Sato, B., Buchhave, L., & and others. HATS-4b: A dense hot Jupiter transiting a super metal-rich G star. United States. doi:10.1088/0004-6256/148/2/29.
Jordán, Andrés, Brahm, Rafael, Rabus, M., Suc, V., Espinoza, N., Bakos, G. Á., Penev, K., Hartman, J. D., Csubry, Z., Bhatti, W., De Val Borro, M., Bayliss, D., Zhou, G., Mancini, L., Mohler-Fischer, M., Ciceri, S., Csák, B., Henning, T., Sato, B., Buchhave, L., and and others. Fri . "HATS-4b: A dense hot Jupiter transiting a super metal-rich G star". United States. doi:10.1088/0004-6256/148/2/29.
@article{osti_22342287,
title = {HATS-4b: A dense hot Jupiter transiting a super metal-rich G star},
author = {Jordán, Andrés and Brahm, Rafael and Rabus, M. and Suc, V. and Espinoza, N. and Bakos, G. Á. and Penev, K. and Hartman, J. D. and Csubry, Z. and Bhatti, W. and De Val Borro, M. and Bayliss, D. and Zhou, G. and Mancini, L. and Mohler-Fischer, M. and Ciceri, S. and Csák, B. and Henning, T. and Sato, B. and Buchhave, L. and and others},
abstractNote = {We report the discovery by the HATSouth survey of HATS-4b, an extrasolar planet transiting a V = 13.46 mag G star. HATS-4b has a period of P ≈ 2.5167 days, mass of M{sub p} ≈ 1.32 M {sub Jup}, radius of R{sub p} ≈ 1.02 R {sub Jup}, and density of ρ {sub p} = 1.55 ± 0.16 g cm{sup –3} ≈1.24 ρ{sub Jup}. The host star has a mass of 1.00 M {sub ☉}, a radius of 0.92 R {sub ☉}, and a very high metallicity [Fe/H]=0.43 ± 0.08. HATS-4b is among the densest known planets with masses between 1 and 2 M {sub J} and is thus likely to have a significant content of heavy elements of the order of 75 M {sub ⊕}. In this paper we present the data reduction, radial velocity measurements, and stellar classification techniques adopted by the HATSouth survey for the CORALIE spectrograph. We also detail a technique for simultaneously estimating vsin i and macroturbulence using high resolution spectra.},
doi = {10.1088/0004-6256/148/2/29},
journal = {Astronomical Journal (New York, N.Y. Online)},
number = 2,
volume = 148,
place = {United States},
year = {Fri Aug 01 00:00:00 EDT 2014},
month = {Fri Aug 01 00:00:00 EDT 2014}
}
  • We report the discovery by the HATSouth survey of HATS-3b, a transiting extrasolar planet orbiting a V = 12.4 F dwarf star. HATS-3b has a period of P = 3.5479 days, mass of M{sub p} = 1.07 M {sub J}, and radius of R{sub p} = 1.38 R {sub J}. Given the radius of the planet, the brightness of the host star, and the stellar rotational velocity (vsin i = 9.0 km s{sup –1}), this system will make an interesting target for future observations to measure the Rossiter-McLaughlin effect and determine its spin-orbit alignment. We detail the low-/medium-resolution reconnaissance spectroscopymore » that we are now using to deal with large numbers of transiting planet candidates produced by the HATSouth survey. We show that this important step in discovering planets produces log g and T {sub eff} parameters at a precision suitable for efficient candidate vetting, as well as efficiently identifying stellar mass eclipsing binaries with radial velocity semi-amplitudes as low as 1 km s{sup –1}.« less
  • We announce the discovery of Kepler-6b, a transiting hot Jupiter orbiting a star with unusually high metallicity, [Fe/H]= +0.34{+-}0.04. The planet's mass is about 2/3 that of Jupiter, M {sub P} = 0.67 M {sub J}, and the radius is 30% larger than that of Jupiter, R {sub P} = 1.32 R {sub J}, resulting in a density of {rho}{sub P} = 0.35 g cm{sup -3}, a fairly typical value for such a planet. The orbital period is P = 3.235 days. The host star is both more massive than the Sun, M {sub *} = 1.21 M {sub sun},more » and larger than the Sun, R {sub *} = 1.39 R {sub sun}.« less
  • We report the discovery of HAT-P-27b, an exoplanet transiting the moderately bright G8 dwarf star GSC 0333-00351 (V = 12.214). The orbital period is 3.039586 {+-} 0.000012 days, the reference epoch of transit is 2455186.01879 {+-} 0.00054 (BJD), and the transit duration is 0.0705 {+-} 0.0019 days. The host star with its effective temperature 5300 {+-} 90 K is somewhat cooler than the Sun and is more metal-rich with a metallicity of +0.29 {+-} 0.10. Its mass is 0.94 {+-} 0.04 M{sub sun} and radius is 0.90{sup +0.05}{sub -0.04} R{sub sun}. For the planetary companion we determine a mass ofmore » 0.660 {+-} 0.033 M{sub J} and radius of 1.038{sup +0.077}{sub -0.058} R{sub J}. For the 30 known transiting exoplanets between 0.3 M{sub J} and 0.8 M{sub J}, a negative correlation between host star metallicity and planetary radius and an additional dependence of planetary radius on equilibrium temperature are confirmed at a high level of statistical significance.« less
  • We report the discovery of HAT-P-25b, a transiting extrasolar planet orbiting the V = 13.19 G5 dwarf star GSC 1788-01237, with a period P = 3.652836 {+-} 0.000019 days, transit epoch T{sub c} = 2455176.85173 {+-} 0.00047 (BJD-barycentric Julian dates throughout the paper are calculated from Coordinated Universal Time, UTC), and transit duration 0.1174 {+-} 0.0017 days. The host star has a mass of 1.01 {+-} 0.03 M{sub Sun }, radius of 0.96{sup +0.05}{sub -0.04} R{sub Sun }, effective temperature 5500 {+-} 80 K, and metallicity [Fe/H] = +0.31 {+-} 0.08. The planetary companion has a mass of 0.567 {+-}more » 0.022 M{sub J} and radius of 1.190{sup +0.081}{sub -0.056} R{sub J} yielding a mean density of 0.42 {+-} 0.07 g cm{sup -3}.« less
  • We report the discovery of HAT-P-24b, a transiting extrasolar planet orbiting the moderately bright V = 11.818 F8 dwarf star GSC 0774-01441, with a period P = 3.3552464 {+-} 0.0000071 days, transit epoch T{sub c} = 2455216.97669 {+-} 0.00024 (BJD)11, and transit duration 3.653 {+-} 0.025 hr. The host star has a mass of 1.191 {+-} 0.042 M{sub sun}, radius of 1.317 {+-} 0.068 R{sub sun}, effective temperature 6373 {+-} 80 K, and a low metallicity of [Fe/H] = -0.16 {+-} 0.08. The planetary companion has a mass of 0.681 {+-} 0.031 M{sub J} and radius of 1.243 {+-} 0.072more » R{sub J} yielding a mean density of 0.439 {+-} 0.069 g cm{sup -3}. By repeating our global fits with different parameter sets, we have performed a critical investigation of the fitting techniques used for previous Hungarian-made Automated Telescope planetary discoveries. We find that the system properties are robust against the choice of priors. The effects of fixed versus fitted limb darkening are also examined. HAT-P-24b probably maintains a small eccentricity of e = 0.052{sup +0.022}{sub -0.017}, which is accepted over the circular orbit model with false alarm probability 5.8%. In the absence of eccentricity pumping, this result suggests that HAT-P-24b experiences less tidal dissipation than Jupiter. Due to relatively rapid stellar rotation, we estimate that HAT-P-24b should exhibit one of the largest known Rossiter-McLaughlin effect amplitudes for an exoplanet ({Delta}V{sub RM} {approx_equal} 95 m s{sup -1}) and thus a precise measurement of the sky-projected spin-orbit alignment should be possible.« less