L-BAND SPECTROSCOPY with MAGELLAN-AO/Clio2: FIRST RESULTS on YOUNG LOW-MASS COMPANIONS

Jordan M. Stone, Joshua A Eisner, Andy Skemer, Katie M. Morzinski, Laird M Close, Jared Males, Timothy J. Rodigas, Philip M Hinz, Alfio Puglisi

Research output: Contribution to journalArticle

2 Citations (Scopus)

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 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/CH4 chemistry.

Original languageEnglish (US)
Article number39
JournalAstrophysical Journal
Volume829
Issue number1
DOIs
StatePublished - Sep 20 2016

Fingerprint

ultrahigh frequencies
probe
aurora
chemistry
probes
near infrared
microgravity
opacity
methane
spectroscopy
adaptive optics
gravity
infrared spectra
atmosphere
carbon
slopes
deviation
gas
atmospheres
stars

Keywords

  • binaries: close
  • stars: atmospheres
  • stars: low-mass

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

L-BAND SPECTROSCOPY with MAGELLAN-AO/Clio2 : FIRST RESULTS on YOUNG LOW-MASS COMPANIONS. / Stone, Jordan M.; Eisner, Joshua A; Skemer, Andy; Morzinski, Katie M.; Close, Laird M; Males, Jared; Rodigas, Timothy J.; Hinz, Philip M; Puglisi, Alfio.

In: Astrophysical Journal, Vol. 829, No. 1, 39, 20.09.2016.

Research output: Contribution to journalArticle

Stone, Jordan M. ; Eisner, Joshua A ; Skemer, Andy ; Morzinski, Katie M. ; Close, Laird M ; Males, Jared ; Rodigas, Timothy J. ; Hinz, Philip M ; Puglisi, Alfio. / L-BAND SPECTROSCOPY with MAGELLAN-AO/Clio2 : FIRST RESULTS on YOUNG LOW-MASS COMPANIONS. In: Astrophysical Journal. 2016 ; Vol. 829, No. 1.
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