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http://hdl.handle.net/20.500.12386/24609
Title: | L-band Spectroscopy with Magellan-AO/Clio2: First Results on Young Low-mass Companions | Authors: | Stone, Jordan M. Eisner, Josh Skemer, Andy Morzinski, Katie M. Close, Laird Males, Jared Rodigas, Timothy J. Hinz, Phil PUGLISI, Alfio Timothy |
Issue Date: | 2016 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 829 | Issue: | 1 | First Page: | 39 | Abstract: | L-band spectroscopy is a powerful probe of cool low-gravity atmospheres: the P, Q, and R branch fundamental transitions of methane near 3.3 μm provide a sensitive probe of carbon chemistry; cloud thickness modifies the spectral slope across the band; and {{{H}}}<SUB>3</SUB><SUP>+</SUP> opacity can be used to detect aurorae. Many directly imaged gas-giant companions to nearby young stars exhibit L-band fluxes distinct from the field population of brown dwarfs at the same effective temperature. Here we describe commissioning the L-band spectroscopic mode of Clio2, the 1-5 μm instrument behind the Magellan adaptive-optics system. We use this system to measure L-band spectra of directly imaged companions. Our spectra are generally consistent with the parameters derived from previous near-infrared spectra for these late M to early L type objects. Therefore, deviations from the field sequence are constrained to occur below 1500 K. This range includes the L-T transition for field objects and suggests that observed discrepancies are due to differences in cloud structure and CO/CH<SUB>4</SUB> chemistry. | URI: | http://hdl.handle.net/20.500.12386/24609 | URL: | https://iopscience.iop.org/article/10.3847/0004-637X/829/1/39 https://arxiv.org/pdf/1608.02597.pdf |
ISSN: | 0004-637X | DOI: | 10.3847/0004-637X/829/1/39 | Bibcode ADS: | 2016ApJ...829...39S | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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