NOAO >   Observing Info >   Approved Programs >   2017A-0203

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Program Information for 2017A-0203


PI: Aaron C Rizzuto, U. of Texas, Austin, arizz@astro.as.utexas.edu
Address: Department of Astronomy, 2515 Speedway, Stop C1400, Austin, Texas 78751 USA

CoI: Andrew Mann, U. of Texas, Austin
CoI: Adam Kraus, U. of Texas, Austin
CoI: Elisabeth Newton, MIT

Title: K2-33: StarSpot Transit Temperature at 10 Myr

Abstract: Magnetic fields and starspots are emerging as a potential solution to the multitude of evolutionary model discrepancies seen for young ($<$20,Myr), convective stars as they evolve towards the main sequence. While some magnetic field strength measurements exist for young stars, there are currently very few starspot temperature measurements in the literature. The newly discovered transiting exoplanet K2-33,b hosted by a 10,Myr old stars in the Upper Scorpius OB association provides a direct means of measuring spot temperatures. We propose to use the SOAR optical imager to obtain transit photometry in the optical K2-33,b, over two transits. These observations will be simultaneous with planned Spitzer observations, and will allow a direct measurement of starspot temperature via the optical-IR color of spot crossing events, and enable us to further study the effect of starspots on derived transit parameters. The short cadence of our proposed observations (compared to the 30,min cadence of the discovery observations from K2) will more precisely map the ingress and egress shape, allowing refinement of the orbital parameters, and provide constraints on atmosphere properties for the planet.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2017A):  SOAR/SOI -- 1n on Jun 02 2017
Run 2 (2017A):  SOAR/SOI -- 0.5n on Jun 13 2017


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NOAO >   Observing Info >   Approved Programs >   2017A-0203

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