NOAO >   Observing Info >   Approved Programs >   2017A-0242

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Program Information for 2017A-0242


PI: Daniel Nusdeo, Georgia State U., nusdeo@astro.gsu.edu
Address: Department of Physics & Astronomy, 25 Park Place, Atlanta 30303 USA

CoI: Todd Henry, Georgia State U.
CoI: Elliott Horch, SCSU
CoI: Jennifer Winters, Harvard-Smithsonian Center for Astrophysics

Title: Searching for Companions to K Dwarfs within 50 Parsecs on Solar System Scales

Abstract: We propose to use the Differential Speckle Survey Instrument (DSSI) on Gemini-S to continue surveying 1048 of the nearest K dwarfs to reveal stellar companions. DSSI on Gemini is able to detect companions with separations as small as the Sun to Mercury for stars out to 50 pc. In past semesters we have surveyed 54% of the sample on Gemini-N and Gemini-S and 38% on DCT. We can finish initial observations in 2017A and begin confirmation observations for the 135 K dwarfs found so far to have candidate companions. The resulting portrait of single, binary, triple, and higher order multiple star systems will drive research on star formation processes for K dwarfs, which provide the missing link between G stars like the Sun and M dwarfs for which out team is submitting a separate proposal. Individual measurements of companion locations and types will be used as benchmarks for decades. Ultimately, we will answer the basic questions of whether or not most stars are single or multiple, by how much the multiplicity changes with stellar mass, what mass ratios are preferred, and which stars orbit one another in such configurations that make it difficult for the creation of planets.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2017A):  GEM-S-SVC/DSSI -- 20hrs band 1 (GS-2017A-Q-12)


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NOAO >   Observing Info >   Approved Programs >   2017A-0242

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