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The Longest Period TESS Planet Yet: A Sub-Neptune Transiting A Bright, Nearby K Dwarf Star | | Diana Dragomir
; Johanna Teske
; Maximilian N. Gunther
; Damien Ségransan
; Jennifer A. Burt
; Chelsea X. Huang
; Andrew Vanderburg
; Elisabeth Matthews
; Xavier Dumusque
; Keivan G. Stassun
; Joshua Pepper
; George R. Ricker
; Roland Vanderspek
; David W. Latham
; Sara Seager
; Joshua N. Winn
; Jon M. Jenkins
; Thomas Beatty
; François Bouchy
; R. Paul Butler
; Jeffrey D. Crane
; Jason D. Eastman
; Jim Francis
; B. Scott Gaudi
; Robert F. Goeke
; David James
; Todd C. Klaus
; Rudolf B. Kuhn
; Christophe Lovis
; Michael B. Lund
; Scott McDermott
; Martin Paegert
; Francesco Pepe
; Joseph E. Rodriguez
; Lizhou Sha
; Stephen A. Shectman
; Robert J. Siverd
; Aylin Garcia Soto
; Daniel J. Stevens
; Ian B. Thompson
; Joseph D. Twicken
; Stéphane Udry
; Steven Villanueva Jr.
; Sharon X. Wang
; Bill Wohler
; Xinyu Yao
; Zhuchang Zhan
; TESS Team
; | | Date: |
31 Dec 2018 | | Abstract: | The future of exoplanet science is bright, as TESS once again demonstrates
with the discovery of its longest-period confirmed planet yet, located only 16
pc away. We hereby present HD 21749b (TOI 186.01), a sub-Neptune in a 36-day
orbit around a bright (V = 8.1), nearby K4.5 dwarf. TESS measures HD21749b to
be 2.84$^{+0.26}_{-0.22}$ $R_{oplus}$, and combined archival and follow-up
precision radial velocity data put the mass of the planet at
$23.20^{+2.13}_{-1.91}$ $M_{oplus}$. HD 21749b is the longest-period TESS
planet confirmed to date, and contributes to the TESS Level 1 Science
Requirement of providing 50 transiting planets smaller than 4 $R_{oplus}$ with
measured masses. Furthermore, we report the discovery of TOI 186.02, a planet
candidate with a 7.8-day period which, if confirmed, could become the first
Earth-sized planet discovered by TESS. The HD21749 system is thus a prime
candidate for comparative studies of planetary composition and architecture in
multi-planet systems. | | Source: | arXiv, 1901.0051 | | Services: | Forum | Review | PDF | Favorites | |
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