Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010lyot.confe..16z&link_type=abstract
Proceedings of the conference In the Spirit of Lyot 2010: Direct Detection of Exoplanets and Circumstellar Disks. October 25 -
Astronomy and Astrophysics
Astronomy
Scientific paper
I will review some of the initial science results from Project 1640, a coronagraphic integral field spectrograph at Palomar Observatory. One of these, emerging from our survey of nearby A stars, is the discovery of an M-dwarf companion to Alcor. To reach this point, we first needed to solve some data reduction problems particular to this kind of instrument, including the automatic translation of 4*104 closely-packed, coarsely-sampled focal plane spectra to data cubes. We confirmed the physical association between Alcor and the fainter neighboring star (at 1" separation and a contrast of 6 magnitudes) using a novel method of high precision relative astrometry applied to two data sets acquired just 100 days apart, demonstrating common parallactic and proper motion. The same data provided a low-resolution near-infrared spectrum spanning the J and H bands, enabling us to classify the companion as an M3-M4 dwarf. In a separate experiment, we have used Project 1640 as an imaging spectrograph without a coronagraph to achieve spectrally-resolved sub-aperture interferometry with a non-redundant mask.
Brenner Douglas
Hinkley Sasha
Oppenheimer Ben R.
Parry Ian
Sivaramakrishnan Anand
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