Two Planets Straddling the Habitable Zone of the Nearby K Dwarf Gl 414A

February 2021 • 2021AJ....161...86D

Authors • Dedrick, Cayla M. • Fulton, Benjamin J. • Knutson, Heather A. • Howard, Andrew W. • Beatty, Thomas G. • Cargile, Phillip A. • Gaudi, B. Scott • Hirsch, Lea A. • Kuhn, Rudolf B. • Lund, Michael B. • James, David J. • Kosiarek, Molly R. • Pepper, Joshua • Petigura, Erik A. • Rodriguez, Joseph E. • Stassun, Keivan G. • Stevens, Daniel J.

Abstract • We present the discovery of two planets orbiting the nearby (D = 11.9 pc) K7 dwarf Gl 414A. Gl 414A b is a sub-Neptune mass planet with ${M}_{b}\sin {i}_{b}={7.60}_{-2.19}^{+2.44}$ M_⊕ and a semimajor axis of 0.23 ± 0.01 au. Gl 414A c is a sub-Saturn mass planet with ${M}_{c}\sin {i}_{c}={53.83}_{-8.58}^{+9.18}$ M_⊕ and a semimajor axis of 1.43 ± 0.06 au. We jointly analyzed radial velocity data from Keck/HIRES and the Automated Planet Finder at Lick Observatory, as well as photometric data from KELT, to detect the two planets and two additional signals related to the rotationally modulated activity and the long-term magnetic activity cycle of the star. The outer planet in this system may be a potential candidate for future direct-imaging missions.

Links

• PREPRINT http://arxiv.org/abs/2009.06503
• ELECTR https://doi.org/10.3847%2F1538-3881%2Fabd0ef
• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2021AJ....161...86D
• PDF https://iopscience.iop.org/article/10.3847/1538-3881/abd0ef/pdf
• PDF https://stacks.iop.org/1538-3881/161/86/pdf
• DATA http://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/161/86
• DATA https://irsa.ipac.caltech.edu/bibdata/2021/D/2021AJ....161...86D.html