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High Resolution Near-Infrared Spectroscopy of Cool Dwarf Stars
Andrea Dupree, Nancy Brickhouse, Jonathan Irwin +2
We present results from a near infrared survey of the He I line (10830 Angstrom) in cool dwarf stars taken with the PHOENIX spectrograph at the 4-m Mayall telescope at Kitt Peak Na…
An increased rate of large flares at intermediate rotation periods for mid-to-late M dwarfs
Nicholas Mondrik, Elisabeth Newton, David Charbonneau. Jonathan Irwin
We present an analysis of flares in mid-to-late M dwarfs in the MEarth photometric survey. We search 3985155 observations across 2226 stars, and detect 54 large () f…
Four new eclipsing mid M-dwarf systems from the New Luyten Two Tenths catalog
Jonathan M. Irwin, David Charbonneau, Gilbert A. Esquerdo +7
Using data from the MEarth-North and MEarth-South transit surveys, we present the detection of eclipses in four mid M-dwarf systems: LP 107-25, LP 261-75, LP 796-24, and LP 991-15.…
New rotation period measurements for M dwarfs in the southern hemisphere: an abundance of slowly rotating, fully convective stars
Elisabeth R. Newton, Nicholas Mondrik, Jonathan Irwin +2
Stellar rotation periods are valuable both for constraining models of angular momentum loss and for under- standing how magnetic features impact inferences of exoplanet parameters.…
LHS 1610A: A Nearby Mid-M Dwarf with a Companion That is Likely A Brown Dwarf
Jennifer G. Winters, Jonathan Irwin, Elisabeth R. Newton +7
We present the spectroscopic orbit of LHS 1610A, a newly discovered single-lined spectroscopic binary with a trigonometric distance placing it at 9.9 pm 0.2 pc. We obtained spectra…