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Physical Parameters of the Multi-Planet Systems HD 106315 and GJ 9827 | Molly R. Kosiarek
; David A. Berardo
; Ian J.M. Crossfield
; Cesar Laguna
; Joseph M. Akana Murphy
; Steve B. Howell
; Gregory W. Henry
; Howard Isaacson
; Lauren M. Weiss
; Erik A. Petigura
; Benjamin Fulton
; Aida Behmard
; Lea A. Hirsch
; Johanna Teske
; Jennifer A. Burt
; Sean M. Mills
; Ashley Chontos
; Teo Mocnik
; Andrew W. Howard
; Michael Werner
; John H. Livingston
; Jessica Krick
; Charles Beichman
; Varoujan Gorjian
; Laura Kreidberg
; Jessie L. Christiansen
; Farisa Y. Morales
; Nicholas J. Scott
; Jeffrey D. Crane
; Lee J. Rosenthal
; Samuel K. Grunblatt
; Ryan A Rubenzahl
; Paul A Dalba
; Steven Giacalone
; Chiara Dane Villanueva
; Qingtian Liu
; Fei Dai
; Michelle L. Hill
; Malena Rice
; Stephen R. Kane
; Andrew W. Mayo
; | Date: |
7 Sep 2020 | Abstract: | HD 106315 and GJ 9827 are two bright, nearby stars that host multiple
super-Earths and sub-Neptunes discovered by K2 that are well suited for
atmospheric characterization. We refined the planets’ ephemerides through
Spitzer transits, enabling accurate transit prediction required for future
atmospheric characterization through transmission spectroscopy. Through a
multi-year high-cadence observing campaign with Keck/HIRES and Magellan/PFS, we
improved the planets’ mass measurements in anticipation of HST transmission
spectroscopy. For GJ 9827, we modeled activity-induced radial velocity signals
with a Gaussian process informed from the Calcium II H&K lines in order to more
accurately model the effect of stellar noise on our data. We found planet
masses of M$_b$=$4.87pm 0.37$ M$_oplus$, M$_c$=$1.92pm 0.49$ M$_oplus$, and
M$_d$=$3.42pm 0.62$ M$_oplus$. For HD 106315, we found that such
activity-radial velocity decorrelation was not effective due to the reduced
presence of spots and speculate that this may extend to other hot stars as well
(T$_{
m {eff}}>6200$ K). We found planet masses of M$_b$=$10.5pm 3.1$
M$_oplus$ and M$_c$=$12.0pm 3.8$ M$_oplus$. We investigated all of the
planets’ compositions through comparing their masses and radii to a range of
interior models. GJ 9827 b and GJ 9827 c are both consistent with an Earth-like
rocky composition, GJ 9827 d and HD 106315 b both require additional volatiles
and are consistent with moderate amounts of water or hydrogen/helium, and HD
106315 c is consistent with 10\% hydrogen/helium by mass. | Source: | arXiv, 2009.03398 | Services: | Forum | Review | PDF | Favorites |
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