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

Dedrick, Cayla M. and Fulton, Benjamin J. and Knutson, Heather A. and Howard, Andrew W. and Beatty, Thomas G. and Cargile, Phillip A. and Gaudi, B. Scott and Hirsch, Lea A. and Kuhn, Rudolf B. and Lund, Michael B. and James, David J. and Kosiarek, Molly R. and Pepper, Joshua and Petigura, Erik A. and Rodriguez, Joseph E. and Stassun, Keivan G. and Stevens, Daniel J. (2020) Two Planets Straddling the Habitable Zone of The Nearby K dwarf Gl 414A. . (Unpublished)

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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 = 9.28^(+3.19)_(−2.54) M_⊕ and a semi-major axis of 0.24 ± 0.01 au. Gl 414A c is a sub-Saturn mass planet with M_c sin i_c = 59.48^(+9.98)_(−9.69) M_⊕ and a semi-major 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 as well as 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 is a potential candidate for future direct imaging missions.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper ItemREBOUND code
Fulton, Benjamin J.0000-0003-3504-5316
Knutson, Heather A.0000-0002-0822-3095
Howard, Andrew W.0000-0001-8638-0320
Beatty, Thomas G.0000-0002-9539-4203
Gaudi, B. Scott0000-0003-0395-9869
Hirsch, Lea A.0000-0001-8058-7443
Kuhn, Rudolf B.0000-0002-4236-9020
Lund, Michael B.0000-0003-2527-1598
James, David J.0000-0001-5160-4486
Kosiarek, Molly R.0000-0002-6115-4359
Pepper, Joshua0000-0002-3827-8417
Petigura, Erik A.0000-0003-0967-2893
Rodriguez, Joseph E.0000-0001-8812-0565
Stassun, Keivan G.0000-0002-3481-9052
Stevens, Daniel J.0000-0002-5951-8328
Additional Information:We are grateful to the time assignment committees of the California Institute of Technology, the University of California, the University of Hawaii, and NASA for their generous allocations of observing time. Without their long-term commitment to RV monitoring, these planets would likely remain unknown. We gratefully acknowledge the efforts and dedication of the staffs of the W. M. Keck Observatory and Mt. Hamilton. Research at theLick Observatory is partially supported by a generous gift from Google. We thank Geoff Marcy and Debra Fischer for their many nights of observing that contributed to the Keck data presented in this work, and R. Paul Butler and S. S. Vogt for many years of contributing to the data presented here. AWH acknowledges NSF grant AST-1517655. MRK acknowledges support from the NSF Graduate Research Fellowship, grant No. DGE 1339067. DJS was supported as an Eberly Research Fellow by the Eberly College of Science at the Pennsylvania State University. The authors extend special thanks to those of Hawaiian ancestry on whose sacred mountain of Maunakea we are privileged to be guests. Without their generous hospitality, the Keck observations presented herein would not have been possible. This work made use of the GNU Parallel package for large-scale multiprocessing (Tange 2018). This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. This work made extensive use of the scipy (Virtanen et al. 2019), numpy (van der Walt et al. 2011), matplotlib (Hunter 2007), and pandas (McKinney 2010) Python packages. Simulations in this paper made use of the REBOUND code which is freely available at Facility: Automated Planet Finder (Levy), Keck:I (HIRES), Exoplanet Archive
Group:Astronomy Department, Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
NSF Graduate Research FellowshipDGE-1339067
Eberly College of ScienceUNSPECIFIED
Pennsylvania State UniversityUNSPECIFIED
Record Number:CaltechAUTHORS:20200916-112858438
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105414
Deposited By: George Porter
Deposited On:24 Sep 2020 20:12
Last Modified:24 Sep 2020 20:12

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