The Longest Period TESS Planet Yet: A Sub-Neptune Transiting A Bright, Nearby K Dwarf Star. (arXiv:1901.00051v1 [astro-ph.EP])

The Longest Period TESS Planet Yet: A Sub-Neptune Transiting A Bright, Nearby K Dwarf Star. (arXiv:1901.00051v1 [astro-ph.EP])
<a href="http://arxiv.org/find/astro-ph/1/au:+Dragomir_D/0/1/0/all/0/1">Diana Dragomir</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Teske_J/0/1/0/all/0/1">Johanna Teske</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gunther_M/0/1/0/all/0/1">Maximilian N. Gunther</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Segransan_D/0/1/0/all/0/1">Damien Ségransan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Burt_J/0/1/0/all/0/1">Jennifer A. Burt</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Huang_C/0/1/0/all/0/1">Chelsea X. Huang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Vanderburg_A/0/1/0/all/0/1">Andrew Vanderburg</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Matthews_E/0/1/0/all/0/1">Elisabeth Matthews</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dumusque_X/0/1/0/all/0/1">Xavier Dumusque</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Stassun_K/0/1/0/all/0/1">Keivan G. Stassun</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pepper_J/0/1/0/all/0/1">Joshua Pepper</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ricker_G/0/1/0/all/0/1">George R. Ricker</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Vanderspek_R/0/1/0/all/0/1">Roland Vanderspek</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Latham_D/0/1/0/all/0/1">David W. Latham</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Seager_S/0/1/0/all/0/1">Sara Seager</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Winn_J/0/1/0/all/0/1">Joshua N. Winn</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Jenkins_J/0/1/0/all/0/1">Jon M. Jenkins</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Beatty_T/0/1/0/all/0/1">Thomas Beatty</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bouchy_F/0/1/0/all/0/1">François Bouchy</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Butler_R/0/1/0/all/0/1">R. Paul Butler</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Crane_J/0/1/0/all/0/1">Jeffrey D. Crane</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Eastman_J/0/1/0/all/0/1">Jason D. Eastman</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Francis_J/0/1/0/all/0/1">Jim Francis</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gaudi_B/0/1/0/all/0/1">B. Scott Gaudi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Goeke_R/0/1/0/all/0/1">Robert F. Goeke</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+James_D/0/1/0/all/0/1">David James</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Klaus_T/0/1/0/all/0/1">Todd C. Klaus</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kuhn_R/0/1/0/all/0/1">Rudolf B. Kuhn</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lovis_C/0/1/0/all/0/1">Christophe Lovis</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lund_M/0/1/0/all/0/1">Michael B. Lund</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+McDermott_S/0/1/0/all/0/1">Scott McDermott</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Paegert_M/0/1/0/all/0/1">Martin Paegert</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pepe_F/0/1/0/all/0/1">Francesco Pepe</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rodriguez_J/0/1/0/all/0/1">Joseph E. Rodriguez</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sha_L/0/1/0/all/0/1">Lizhou Sha</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Shectman_S/0/1/0/all/0/1">Stephen A. Shectman</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Siverd_R/0/1/0/all/0/1">Robert J. Siverd</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Soto_A/0/1/0/all/0/1">Aylin Garcia Soto</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Stevens_D/0/1/0/all/0/1">Daniel J. Stevens</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Thompson_I/0/1/0/all/0/1">Ian B. Thompson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Twicken_J/0/1/0/all/0/1">Joseph D. Twicken</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Udry_S/0/1/0/all/0/1">Stéphane Udry</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Villanueva_S/0/1/0/all/0/1">Steven Villanueva Jr.</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wang_S/0/1/0/all/0/1">Sharon X. Wang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wohler_B/0/1/0/all/0/1">Bill Wohler</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yao_X/0/1/0/all/0/1">Xinyu Yao</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zhan_Z/0/1/0/all/0/1">Zhuchang Zhan</a>, et al. (1 additional author not shown)

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.

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