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Variability in gas-phase co reservoirs in massive young stellar cores and binaries

Smith, R. L. and Boogert, A. C. A. and Blake, G. A. and Pontoppidan, K. M. (2021) Variability in gas-phase co reservoirs in massive young stellar cores and binaries. Meteoritics and Planetary Science, 56 (S1). Art. No. 250. ISSN 1086-9379. doi:10.1111/maps.13727.

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High-resolution observations of young stellar objects (YSOs) are exciting windows into protoplanetary chemistry. Near-infrared observations of carbon monoxide (CO) gas toward YSOs and evaluation of carbon and oxygen isotopes therin have provided insights into protoplanetary processes with implications for the evolution of carbon in the early solar nebula [1-7]. Each YSO observation reveals a snapshot in a ~million-yr timescale of disk evolution; yet, YSOs have also been observed to vary significantly in timescales of months to a few years. For example, infrared fluxes in late-stage solar-type disks show up to 50% variability [8], and 70% of Class I and II YSOs in Orion vary in infrared amplitudes [9]. Structural changes in the inner disk could also influence lightcurve variations in certain YSOs [10], and disk dynamics could lead to photometric variability in within a few years [11]. Our preliminary analysis on abundance variation in CO using archival VLT-CRIRES data revealed that [¹³CO]/[C¹⁸O] ratios for low-mass YSOs could vary significantly (~53% to 63%) [12]. Here we present ongoing results of short-term variability in gas-phase CO toward a range of massive YSOs using high-resolution spectra observed at NASA’s IRTF observatory. This study explores a range of environments: solar-type and massive YSO cores, as well as binary pairs – unique targets that inform chemical evolution in systems with stellar multiplicity.

Item Type:Article
Related URLs:
URLURL TypeDescription
Boogert, A. C. A.0000-0001-9344-0096
Blake, G. A.0000-0003-0787-1610
Pontoppidan, K. M.0000-0001-7552-1562
Additional Information:© 2021 The Meteoritical Society. Issue Online: 09 August 2021. We gratefully acknowledge support by NASA Emerging Worlds (Grant NNX17AE34G).
Funding AgencyGrant Number
Issue or Number:S1
Record Number:CaltechAUTHORS:20211008-213629678
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Official Citation:(2021), 84th Annual Meeting of the Meteoritical Society (2021). Meteorit Planet Sci, 56: A1-A300.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:111305
Deposited By: Tony Diaz
Deposited On:08 Oct 2021 22:55
Last Modified:16 Nov 2021 19:44

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