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Temporal Variability in Carbon Monoxide Abundances in Young Stellar Objects and Implications for the Early Solar System

Smith, R. L. and Blake, G. A. and Pontoppidan, K. M. and Boogert, A. C. A. (2019) Temporal Variability in Carbon Monoxide Abundances in Young Stellar Objects and Implications for the Early Solar System. Meteoritics and Planetary Science, 54 (S2). p. 6486. ISSN 1086-9379. doi:10.1111/maps.13346.

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Observations of young stellar objects (YSOs) provide a unique window into protoplanetary chemistry. In particular, high-resolution near-infrared observations of carbon monoxide (CO) gas toward YSOs and evaluation of carbon and oxygen isotopes have yielded valuable insights into protoplanetary processes with implications for the early solar nebula [1-7]. While each spectral observation is a snapshot in a several-million-years timescale, YSOs have interestingly been observed to vary in several important parameters over timescales of months to a few years. For example, observations of late-stage solar-type disks reveal up to 50% variability in infrared (IR) fluxes, possibly due to the stellar companions or magnetic fields [8], and 70% of Class I and II YSOs studied in Orion show IR variability in amplitude, possibly due to gas extinction or warps in disk geometry [9]. Significant light-curve variations have further been found in YSOs of the Lynds 1688 region, attributed to possible structural changes in the inner disk [10], and IR photometric variability in nearly 100 YSOs in Cygnus observed over a few years could be due to changes in disk dynamics [11]. Here we present our intial variability analysis of gas-phase CO observations toward a range of solar-type and massive YSOs, with separations in observations of each YSO target ranging from months to a few years. This study is centered on exploring how key molecular reservoirs may vary in the very shortterm in evolving systems, and how these variations may differ between solar-type and massive YSOs.

Item Type:Article
Related URLs:
URLURL TypeDescription
Blake, G. A.0000-0003-0787-1610
Pontoppidan, K. M.0000-0001-7552-1562
Additional Information:© 2019 The Meteoritical Society. Issue Online: 19 June 2019; Version of Record online: 19 June 2019. We gratefully acknowledge support by NASA Emerging Worlds (Grant NNX17AE34G).
Group:Astronomy Department
Funding AgencyGrant Number
Issue or Number:S2
Record Number:CaltechAUTHORS:20190709-102536269
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Official Citation:(2019), 82nd Annual Meeting of The Meteoritical Society (2019). Meteorit Planet Sci, 54: A1-A509. doi:10.1111/maps.13346
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96995
Deposited By: Tony Diaz
Deposited On:09 Jul 2019 19:59
Last Modified:16 Nov 2021 17:25

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