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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: 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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