TY - JOUR
T1 - Ultra-short-period Planets in K2. III. Neighbors are Common with 13 New Multiplanet Systems and 10 Newly Validated Planets in Campaigns 0-8 and 10
AU - Adams, Elisabeth R.
AU - Jackson, Brian
AU - Johnson, Samantha
AU - Ciardi, David R.
AU - Cochran, William D.
AU - Endl, Michael
AU - Everett, Mark E.
AU - Furlan, Elise
AU - Howell, Steve B.
AU - Jayanthi, Prasanna
AU - Macqueen, Phillip J.
AU - Matson, Rachel A.
AU - Partyka-Worley, Ciera
AU - Schlieder, Joshua
AU - Scott, Nicholas J.
AU - Stanton, Sevio M.
AU - Ziegler, Carl
N1 - Funding Information:
This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/ gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/ dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.
Funding Information:
This study is based upon work supported by NASA under grant No. NNX15AB78G issued through the Astrophysical Data Analysis Program by Science Mission Directorate and under grant No. NNX17AB94G through the Exoplanets Research Program. M.E. and W.D.C. were supported by NASA K2 Guest Observer grants NNX15AV58G, NNX16AE70G, and NNX16AE58G to The University of Texas at Austin.
Funding Information:
This research was supported in part by the National Science Foundation under grant No. NSF PHY-1748958 under the auspices of UC Santa Barbara’s Kavli Institute for Theoretical Physics.
Publisher Copyright:
© 2021. The Author(s). Published by the American Astronomical Society.
PY - 2021/8
Y1 - 2021/8
N2 - Utilizing the EVEREST photometry pipeline, 74 ultra-short-period planets (USPs) candidates with orbital periods less than a day were identified in the initial data from K2's campaigns, including 33 new candidates. A further search revealed 13 new multi-planet systems containing a USP, doubling the known number and accounting for a third of the K2's USP sample. Additionally, 30 companions with periods ranging from 1.4 to 31 days were identified. Out of these, 36 candidates including 10 new ones, have been statistically validated or confirmed, with seven being USPs. Almost all candidates, especially validated ones, are small with a median radius of 1.1 Earth radii (R⊕), showcasing a range between 0.4 R⊕ and 2.4 R⊕ with periods ranging from 0.18 to 0.96 days. The absence of ultra-hot-Jupiter and short-period desert planets suggests such populations are rare, though some deep transits might have been missed. The findings also indicate that there isn't a lower limit on planetary radius values for close-orbit planets, hinting at the possibility of discovering more USPs with improved photometry techniques. A significant portion of USPs in known multi-planet systems supports theories of origin involving dynamical interactions with exterior planets and tidal decay of USP orbits. This work was published by the American Astronomical Society in 2021.
AB - Utilizing the EVEREST photometry pipeline, 74 ultra-short-period planets (USPs) candidates with orbital periods less than a day were identified in the initial data from K2's campaigns, including 33 new candidates. A further search revealed 13 new multi-planet systems containing a USP, doubling the known number and accounting for a third of the K2's USP sample. Additionally, 30 companions with periods ranging from 1.4 to 31 days were identified. Out of these, 36 candidates including 10 new ones, have been statistically validated or confirmed, with seven being USPs. Almost all candidates, especially validated ones, are small with a median radius of 1.1 Earth radii (R⊕), showcasing a range between 0.4 R⊕ and 2.4 R⊕ with periods ranging from 0.18 to 0.96 days. The absence of ultra-hot-Jupiter and short-period desert planets suggests such populations are rare, though some deep transits might have been missed. The findings also indicate that there isn't a lower limit on planetary radius values for close-orbit planets, hinting at the possibility of discovering more USPs with improved photometry techniques. A significant portion of USPs in known multi-planet systems supports theories of origin involving dynamical interactions with exterior planets and tidal decay of USP orbits. This work was published by the American Astronomical Society in 2021.
KW - Exoplanet catalogs (488)
KW - Exoplanet evolution (491)
KW - Exoplanet formation (492)
KW - Transit photometry (1709)
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U2 - 10.3847/PSJ/ac0ea0
DO - 10.3847/PSJ/ac0ea0
M3 - Article
AN - SCOPUS:85114383038
VL - 2
JO - Planetary Science Journal
JF - Planetary Science Journal
IS - 4
M1 - 152
ER -