NOAO >   Observing Info >   Approved Programs >   2018A-0374

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Program Information for 2018A-0374


PI: Adam Kraus, U. of Texas, Austin, alk@astro.as.utexas.edu
Address: USA

CoI: Kevin Covey, Western Washington U.
CoI: Ann Marie Cody, NASA Ames Research Center
CoI: Gregory Feiden, University of North Georgia
CoI: Aaron C Rizzuto, U. of Texas, Austin
CoI: Andrew Mann, Columbia U.
CoI: Michael Ireland, Australian National U.
CoI: Gregory Mace, U. of Texas, Austin
CoI: Kimberly Sokal, U. of Texas, Austin
CoI: Daniel Jaffe, U. of Texas, Austin

Title: The Mass-Radius Relation at 10 Myr from K2

Abstract: The repurposed Kepler mission (K2) has observed the ~10 Myr Upper Scorpius subgroup of the Sco-Cen OB association. We proposed 1400 confirmed or candidate young stars to be observed by K2 for 80 days, among which we found 15 eclipsing binaries spanning spectral types B3-M7 (5 Msun to 50 MJup). These eclipsing binaries will calibrate stellar evolutionary models with a densely sampled mass-radius relation at the peak epoch of planet formation, and potentially point the way to additional physics (such as magnetic fields) that must be included in those models. Our preliminary results indicate that stellar masses are being underestimated by up to 50 percent, indicating grave errors in studies of the IMF, planet/disk properties, and other mass- and age-dependent features of young stellar populations. We propose to observe with the NIR echelle spectrograph IGRINS on Gemini-South for 25.36 hours to obtain RV observations at <0.5 km/s precision, fully characterizing the orbits of the EBs. We also propose a subset of observations to obtain high-SNR observations suitable for detailed stellar characterization (Teff, log(g), abundances, and magnetic fields). We have observed the brighter and more northern members of the sample with IGRINS from McDonald Observatory, but most of the least massive sample members are either too faint or too far south, and must be observed from Gemini.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2018A):  GEM-SQ/IGRINS -- 25.6hrs band 1 (GS-2018A-Q-118 )


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NOAO >   Observing Info >   Approved Programs >   2018A-0374

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