6 Cold Jovians from N2K, nondetection of HD 73256 b

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6 Cold Jovians from N2K, nondetection of HD 73256 b

Post by Sirius_Alpha on 5th September 2018, 8:37 pm

Radial velocities from the N2K Project: 6 new cold gas giant planets orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810
https://arxiv.org/abs/1809.01228

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 (Msini of 1.23 and 5.16 MJUP) and single planet detections around HD 55696 (Msini = 3.87 MJUP), HD 98736 (Msini = 2.33 MJUP), HD 203473 (Msini = 7.8 MJUP), and HD 211810 (Msini = 0.67 MJUP). These gas giant companions have orbital semi-major 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 Msini between 20 to 30 MJUP, 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 find that many hot Jupiters from our sample could be detectable by state-of-the-art telescopes such as Gaia.

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Re: 6 Cold Jovians from N2K, nondetection of HD 73256 b

Post by Lazarus on 6th September 2018, 12:21 pm

HD 207832 comes out as a one-planet system, looks like HD 207832 c joins HD 73256 b in the non-confirmed planets bin.
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