Details

Autor(en) / Beteiligte

• Lubin, Jack
• Van Zandt, Judah
• Holcomb, Rae
• Weiss, Lauren M.
• Petigura, Erik A
• Robertson, Paul
• Akana Murphy, Joseph M.
• Scarsdale, Nicholas
• Batygin, Konstantin
• Polanski, Alex S.
• Batalha, Natalie M.
• Crossfield, Ian J. M.
• Dressing, Courtney
• Fulton, Benjamin
• Howard, Andrew W.
• Huber, Daniel
• Isaacson, Howard
• Kane, Stephen R.
• Roy, Arpita
• Beard, Corey
• Blunt, Sarah
• Chontos, Ashley
• Dai, Fei
• Dalba, Paul A.
• Gary, Kaz
• Giacalone, Steven
• Hill, Michelle L.
• Mayo, Andrew
• Močnik, Teo
• Kosiarek, Molly R.
• Rice, Malena
• Rubenzahl, Ryan A.
• Latham, David W.
• Seager, S.
• Winn, Joshua N.

Titel

TESS-Keck Survey. IX. Masses of Three Sub-Neptunes Orbiting HD 191939 and the Discovery of a Warm Jovian plus a Distant Substellar Companion

Ist Teil von

• The Astronomical journal, 2022-02, Vol.163 (2), p.101

Ort / Verlag

Madison: The American Astronomical Society

Erscheinungsjahr

2022

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Abstract Exoplanet systems with multiple transiting planets are natural laboratories for testing planetary astrophysics. One such system is HD 191939 (TOI 1339), a bright ( V = 9) and Sun-like (G9V) star, which TESS found to host three transiting planets (b, c, and d). The planets have periods of 9, 29, and 38 days each with similar sizes from 3 to 3.4 R ⊕ . To further characterize the system, we measured the radial velocity (RV) of HD 191939 over 415 days with Keck/HIRES and APF/Levy. We find that M b = 10.4 ± 0.9 M ⊕ and M c = 7.2 ± 1.4 M ⊕ , which are low compared to most known planets of comparable radii. The RVs yield only an upper limit on M d (<5.8 M ⊕ at 2 σ ). The RVs further reveal a fourth planet (e) with a minimum mass of 0.34 ± 0.01 M Jup and an orbital period of 101.4 ± 0.4 days. Despite its nontransiting geometry, secular interactions between planet e and the inner transiting planets indicate that planet e is coplanar with the transiting planets (Δ i < 10°). We identify a second high-mass planet (f) with 95% confidence intervals on mass between 2 and 11 M Jup and period between 1700 and 7200 days, based on a joint analysis of RVs and astrometry from Gaia and Hipparcos. As a bright star hosting multiple planets with well-measured masses, HD 191939 presents many options for comparative planetary astronomy, including characterization with JWST.