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2018 Hot Sci @ STScI

RELICS and a Candidate Spatially Resolved Arc at z ~ 10, Polar Disks and Planets Around Eccentric Binaries

Presented by: Brett Salmon, Steve Lubow  (STScI)
Category: Science Colloquia   Duration: 1 hour   Broadcast date: June 27, 2018
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6/27/18 Brett Salmon (STScI) Title: RELICS and a Candidate Spatially Resolved Arc at z ~ 10 Abstract: The most distant galaxies known are at z~10-11, observed 400-500 Myr after the Big Bang. The few z~10-11 candidates discovered to date have been exceptionally small— barely resolved, if at all, by the Hubble Space Telescope. In this talk I will present the discovery of SPT0615-JD, a fortuitous z~10 galaxy candidate stretched into an arc over 2.5” by the effects of strong gravitational lensing. Discovered in the Reionization Lensing Cluster Survey (RELICS) Hubble and Spitzer program, this candidate is bright (H~24.7 AB mag) and with a lensing magnification of 4-7 and shear. The unprecedented lensed size of this z~10 candidate offers the potential for the James Webb Space Telescope to study the geometric and kinematic properties of a galaxy observed 500 Myr after the Big Bang. I will also present the sample of bright, lensed galaxy candidates at z>6 found in RELICS that include other rare high-z arcs. 6/27/18 Steve Lubow (STScI) Title: Polar Disks and Planets Around Eccentric Binaries Abstract: Observations have revealed the presence of circumbinary disks that are misaligned with respect to the central binary. Previous theoretical studies of circumbinary disks in young binary star systems have shown that these disks evolve towards coplanarity with the binary. However, these studies assumed that the binary orbit is circular. We (Martin & Lubow 2017; Lubow & Martin 2018) have recently shown that low mass moderately misaligned gaseous protostellar disks around eccentric orbit binaries can evolve to polar alignment in which they lie perpendicular to the binary orbit. This evolution process naturally explains the existence of the observed polar debris disk around 99 Her (Kennedy et al. 2012) and some unpublished observations of possible circumbinary planets that are misaligned with respect to their central binary.