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Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810

Ment, Kristo and Fischer, Debra A. and Bakos, Gáspár and Howard, Andrew W. and Isaacson, Howard (2018) Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810. ASTRONOMICAL JOURNAL, 156. ISSN 0004-6256

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Abstract

The N2K planet search program was designed to exploit the planet- metallicity correlation by searching for gas giant planets orbiting metal-rich stars. Here, we present the radial velocity measurements for 378 N2K target stars that were observed with the HIRES spectrograph at Keck Observatory between 2004 and 2017. With this data set, we announce the discovery of six new gas giant exoplanets: a double-planet system orbiting HD 148164 (M\\sin i of 1.23 and 5.16 M JUP) and single planet detections around HD 55696 (M\\sin i = 3.87 M JUP), HD 98736 (M\\sin i =2.33 M JUP), HD 203473 (M\\sin i = 7.8 M JUP), and HD 211810 (M\\sin i = 0.67 M JUP). These gas giant companions have orbital semimajor axes between 1.0 and 6.2 au and eccentricities ranging from 0.13 to 0.71. We also report evidence for three gravitationally bound companions with M\\sin i between 20 and 30 M JUP, placing them in the mass range of brown dwarfs, around HD 148284, HD 214823, and HD 217850, and four low-mass stellar companions orbiting HD 3404, HD 24505, HD 98630, and HD 103459. In addition, we present updated orbital parameters for 42 previously announced planets. We also report a nondetection of the putative companion HD 73256 b. Finally, we highlight the most promising candidates for direct imaging and astrometric detection, and we find that many hot Jupiters from our sample could be detectable by state-of- the-art telescopes such as Gaia.

Item Type: Article
Subjects: Q Science / természettudomány > Q1 Science (General) / természettudomány általában
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 30 Mar 2023 13:52
Last Modified: 30 Mar 2023 13:52
URI: http://real.mtak.hu/id/eprint/163172

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