Disk Evolution of Young Stellar Objects in Lynds 1641

J. S. Kim, M. Fang (Lead / Corresponding author), Roy Van Boekel, Aurora Sicilia-Aguilar, Th. Henning

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

We study circumstellar disk evolution in young star forming regions under various environments, and here we present our recent results in Lynds 1641 located at Orion A cloud. Planet formation is one of the mechanisms for disk dispersal, however, other possible mechanisms include photoevaporation, grain growth, magneto-rotational instability, and close companion. In order to study disk dispersal mechanisms, we carried out multi-wavelength imaging and optical spectroscopic studies of young stellar objects (YSOs) in Lynds1641, and identified ?1390 YSOs. We followed up with optical spectroscopy using MMT/Hectospec and Hectochelle for low - high resolution spectroscopy. We summarize our recent findings from both imaging and spectroscopic analysis (Fang, Kim, van Boekel et al. 2013): we identifed 143 Class I sources, 131 Flat spectrum sources, 533 Class II sources, and 507 class III sources. Among the confirme YSOs, 46 of them are transition disks in L1641. We find that: (i) both clustered and isolated mode of star formation are seen in L1641; (ii) there are age differences in median age for different disk morphologies (?1.1Myr for optically thick disks, ?1.5Myr for trandision disks, and ?1.8Myr for diskless stars); (iii) ?80% of optically thick disks show accretion, while ?40-45% of transition disks show accretion; (iv) amplitude of accretion rate and variability for both optically thick disks and transition disks are similar; (v) accretion variability can account for about 0.6 dex in accretion rate vs. mass relation; and (vi) disk frequency of the L1641 region is about 50%.
Original languageEnglish
Title of host publicationTenth Pacific Rim Conference on Stellar Astrophysics
EditorsHee-Won Lee, Young Woon Kang, Kim-Ching Leung
Place of PublicationUnited States
Pages41
Number of pages1
Volume482
ISBN (Electronic)9781583818497
DOIs
Publication statusPublished - Aug 2014
EventTenth Pacific Rim Conference on Stellar Astrophysics - Sejong University Convention Center, Seoul, Korea, Republic of
Duration: 27 May 201431 May 2014
http://www.aconf.org/en-us/conf_30228.html

Publication series

NameASP Conference Series
PublisherAstronomical Society of the Pacific

Conference

ConferenceTenth Pacific Rim Conference on Stellar Astrophysics
CountryKorea, Republic of
CitySeoul
Period27/05/1431/05/14
Internet address

Fingerprint

accretion disks
stars
spectroscopic analysis
spectroscopy
star formation
planets
high resolution
wavelengths

Cite this

Kim, J. S., Fang, M., Van Boekel, R., Sicilia-Aguilar, A., & Henning, T. (2014). Disk Evolution of Young Stellar Objects in Lynds 1641. In H-W. Lee, Y. Woon Kang, & K-C. Leung (Eds.), Tenth Pacific Rim Conference on Stellar Astrophysics (Vol. 482, pp. 41). (ASP Conference Series). United States. https://doi.org/http://adsabs.harvard.edu/abs/2014ASPC..482...41K
Kim, J. S. ; Fang, M. ; Van Boekel, Roy ; Sicilia-Aguilar, Aurora ; Henning, Th. / Disk Evolution of Young Stellar Objects in Lynds 1641. Tenth Pacific Rim Conference on Stellar Astrophysics. editor / Hee-Won Lee ; Young Woon Kang ; Kim-Ching Leung. Vol. 482 United States, 2014. pp. 41 (ASP Conference Series).
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Kim, JS, Fang, M, Van Boekel, R, Sicilia-Aguilar, A & Henning, T 2014, Disk Evolution of Young Stellar Objects in Lynds 1641. in H-W Lee, Y Woon Kang & K-C Leung (eds), Tenth Pacific Rim Conference on Stellar Astrophysics. vol. 482, ASP Conference Series, United States, pp. 41, Tenth Pacific Rim Conference on Stellar Astrophysics, Seoul, Korea, Republic of, 27/05/14. https://doi.org/http://adsabs.harvard.edu/abs/2014ASPC..482...41K

Disk Evolution of Young Stellar Objects in Lynds 1641. / Kim, J. S.; Fang, M. (Lead / Corresponding author); Van Boekel, Roy; Sicilia-Aguilar, Aurora; Henning, Th.

Tenth Pacific Rim Conference on Stellar Astrophysics. ed. / Hee-Won Lee; Young Woon Kang; Kim-Ching Leung. Vol. 482 United States, 2014. p. 41 (ASP Conference Series).

Research output: Chapter in Book/Report/Conference proceedingChapter

TY - CHAP

T1 - Disk Evolution of Young Stellar Objects in Lynds 1641

AU - Kim, J. S.

AU - Fang, M.

AU - Van Boekel, Roy

AU - Sicilia-Aguilar, Aurora

AU - Henning, Th.

N1 - Paper

PY - 2014/8

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N2 - We study circumstellar disk evolution in young star forming regions under various environments, and here we present our recent results in Lynds 1641 located at Orion A cloud. Planet formation is one of the mechanisms for disk dispersal, however, other possible mechanisms include photoevaporation, grain growth, magneto-rotational instability, and close companion. In order to study disk dispersal mechanisms, we carried out multi-wavelength imaging and optical spectroscopic studies of young stellar objects (YSOs) in Lynds1641, and identified ?1390 YSOs. We followed up with optical spectroscopy using MMT/Hectospec and Hectochelle for low - high resolution spectroscopy. We summarize our recent findings from both imaging and spectroscopic analysis (Fang, Kim, van Boekel et al. 2013): we identifed 143 Class I sources, 131 Flat spectrum sources, 533 Class II sources, and 507 class III sources. Among the confirme YSOs, 46 of them are transition disks in L1641. We find that: (i) both clustered and isolated mode of star formation are seen in L1641; (ii) there are age differences in median age for different disk morphologies (?1.1Myr for optically thick disks, ?1.5Myr for trandision disks, and ?1.8Myr for diskless stars); (iii) ?80% of optically thick disks show accretion, while ?40-45% of transition disks show accretion; (iv) amplitude of accretion rate and variability for both optically thick disks and transition disks are similar; (v) accretion variability can account for about 0.6 dex in accretion rate vs. mass relation; and (vi) disk frequency of the L1641 region is about 50%.

AB - We study circumstellar disk evolution in young star forming regions under various environments, and here we present our recent results in Lynds 1641 located at Orion A cloud. Planet formation is one of the mechanisms for disk dispersal, however, other possible mechanisms include photoevaporation, grain growth, magneto-rotational instability, and close companion. In order to study disk dispersal mechanisms, we carried out multi-wavelength imaging and optical spectroscopic studies of young stellar objects (YSOs) in Lynds1641, and identified ?1390 YSOs. We followed up with optical spectroscopy using MMT/Hectospec and Hectochelle for low - high resolution spectroscopy. We summarize our recent findings from both imaging and spectroscopic analysis (Fang, Kim, van Boekel et al. 2013): we identifed 143 Class I sources, 131 Flat spectrum sources, 533 Class II sources, and 507 class III sources. Among the confirme YSOs, 46 of them are transition disks in L1641. We find that: (i) both clustered and isolated mode of star formation are seen in L1641; (ii) there are age differences in median age for different disk morphologies (?1.1Myr for optically thick disks, ?1.5Myr for trandision disks, and ?1.8Myr for diskless stars); (iii) ?80% of optically thick disks show accretion, while ?40-45% of transition disks show accretion; (iv) amplitude of accretion rate and variability for both optically thick disks and transition disks are similar; (v) accretion variability can account for about 0.6 dex in accretion rate vs. mass relation; and (vi) disk frequency of the L1641 region is about 50%.

UR - http://www.aspbooks.org/a/volumes/table_of_contents/?book_id=545

U2 - http://adsabs.harvard.edu/abs/2014ASPC..482...41K

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M3 - Chapter

SN - 9781583818480

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BT - Tenth Pacific Rim Conference on Stellar Astrophysics

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A2 - Leung, Kim-Ching

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Kim JS, Fang M, Van Boekel R, Sicilia-Aguilar A, Henning T. Disk Evolution of Young Stellar Objects in Lynds 1641. In Lee H-W, Woon Kang Y, Leung K-C, editors, Tenth Pacific Rim Conference on Stellar Astrophysics. Vol. 482. United States. 2014. p. 41. (ASP Conference Series). https://doi.org/http://adsabs.harvard.edu/abs/2014ASPC..482...41K