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dc.contributor.authorMuirhead, Philip S.
dc.date.accessioned2019-05-10T18:10:14Z
dc.date.available2019-05-10T18:10:14Z
dc.date.issued2011
dc.identifier.citationPS Muirhead. 2011. "Externally Dispersed Interferometry for Terrestrial Exoplanet Detection."
dc.identifier.urihttps://hdl.handle.net/2144/35591
dc.description.abstractTerrestrial exoplanets are observationally challenging to detect and characterize. Compared to gas giant exoplanets, terrestrial exoplanets introduce significantly smaller radial velocity signals and transit depths on their host stars. The signals are larger for terrestrial exoplanets orbiting M-dwarf stars, which have lower masses and radii than Sun-like F, G and K-type stars, and dominate stellar populations by number. Detecting exoplanets around M dwarfs is itself difficult because of their lower luminosities and lower flux at visible wavelengths, where most radial velocity and transit exoplanet surveys operate. I present here the motivation, development and results from a radial velocity program conducted on M dwarfs using near-infrared wavelengths, where M dwarf spectra peak in flux. To achieve high radial-velocity precision, I have used a technique called externally dispersed interferometry. It involves the combination of an interferometer and a moderate-resolution spectrograph on the 200 inch (5.1 m) Hale Telescope at Palomar Observatory. The TripleSpec Exoplanet Discovery Instrument, or TEDI, is the first such instrument to operate at nearinfrared wavelengths. Our results indicate that contamination by narrow absorption lines introduced by the Earth's atmosphere limit radial velocity performance to that which can detect gas giant planets. I have conducted a survey of nearby M dwarfs, and can rule out with 3σ confidence the presence of short-period gas giant planets in circular orbits around a few nearby M dwarfs. The results of this experiment direct future extrasolar planet instrumentation toward spectral regions with little telluric contamination and with higher resolution, to detect terrestrial exoplanets orbiting M dwarfs.en_US
dc.language.isoen_USen_US
dc.subjectExtrasolar planetsen_US
dc.subjectAstronomical instrumentationen_US
dc.subjectData analysis and techniquesen_US
dc.titleExternally dispersed interferometry for terrestrial exoplanet detectionen_US
dc.typeThesis/Dissertationen_US
dc.description.versionPublished versionen_US
pubs.elements-sourcemanual-entryen_US
pubs.notesEmbargo: Not knownen_US
pubs.organisational-groupBoston Universityen_US
pubs.organisational-groupBoston University, College of Arts & Sciencesen_US
pubs.organisational-groupBoston University, College of Arts & Sciences, Department of Astronomyen_US
dc.identifier.orcid0000-0002-0638-8822 (Muirhead, PS)


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