Details

Autor(en) / Beteiligte

• Christiansen, Jessie L.
• Crossfield, Ian J. M.
• Barentsen, Geert
• Lintott, Chris J.
• Barclay, Thomas
• Simmons, Brooke . D.
• Petigura, Erik
• Schlieder, Joshua E.
• Dressing, Courtney D.
• Vanderburg, Andrew
• Allen, Campbell
• McMaster, Adam
• Miller, Grant
• Veldthuis, Martin
• Allen, Sarah
• Wolfenbarger, Zach
• Cox, Brian
• Zemiro, Julia
• Howard, Andrew W.
• Livingston, John
• Sinukoff, Evan
• Catron, Timothy
• Grey, Andrew
• Kusch, Joshua J. E.
• Terentev, Ivan
• Vales, Martin
• Kristiansen, Martti H.

Titel

The K2-138 System: A Near-resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists

Ist Teil von

• The Astronomical journal, 2018-02, Vol.155 (2), p.57

Ort / Verlag

Madison: The American Astronomical Society

Erscheinungsjahr

2018

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• K2-138 is a moderately bright (V = 12.2, K = 10.3) main-sequence K star observed in Campaign 12 of the NASA K2 mission. It hosts five small (1.6-3.3 ) transiting planets in a compact architecture. The periods of the five planets are 2.35, 3.56, 5.40, 8.26, and 12.76 days, forming an unbroken chain of near 3:2 resonances. Although we do not detect the predicted 2-5 minute transit timing variations (TTVs) with the K2 timing precision, they may be observable by higher-cadence observations with, for example, Spitzer or CHEOPS. The planets are amenable to mass measurement by precision radial velocity measurements, and therefore K2-138 could represent a new benchmark system for comparing radial velocity and TTV masses. K2-138 is the first exoplanet discovery by citizen scientists participating in the Exoplanet Explorers project on the Zooniverse platform.