Young Stellar Objects and Protostellar Disks

Castro, Gómez de; Inés, Ana

doi:10.1007/978-94-007-5615-1_6

Cited by 10 publications

(2 citation statements)

References 178 publications

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“…The SED of ZTF J231957.42+584446.2 (shown as red circles in Figure 18) is broad, with a slope of α IR ∼ −0.37 at λ = 2.2 μm. It is consistent with a YSO that is surrounded by hot circumstellar materials, in which the SED of the latter is superposed on that of the stellar blackbody (André 2011;Castro 2013), known as a Class II YSO (André 2011).…”

Section: Anomalies Inconsistent With Evolved Starssupporting

confidence: 69%

Searching for Anomalies in the ZTF Catalog of Periodic Variable Stars

Chan

Villar

Cheung

et al. 2022

ApJ

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Periodic variables illuminate the physical processes of stars throughout their lifetime. Wide-field surveys continue to increase our discovery rates of periodic variable stars. Automated approaches are essential to identify interesting periodic variable stars for multiwavelength and spectroscopic follow-up. Here we present a novel unsupervised machine-learning approach to hunt for anomalous periodic variables using phase-folded light curves presented in the Zwicky Transient Facility Catalogue of Periodic Variable Stars by Chen et al. We use a convolutional variational autoencoder to learn a low-dimensional latent representation, and we search for anomalies within this latent dimension via an isolation forest. We identify anomalies with irregular variability. Most of the top anomalies are likely highly variable red giants or asymptotic giant branch stars concentrated in the Milky Way galactic disk; a fraction of the identified anomalies are more consistent with young stellar objects. Detailed spectroscopic follow-up observations are encouraged to reveal the nature of these anomalies.

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Section: Anomalies Inconsistent With Evolved Starssupporting

confidence: 69%

Searching for Anomalies in the ZTF Catalog of Periodic Variable Stars

Chan

Villar

Cheung

et al. 2022

ApJ

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show abstract

“…The SED of ZTFJ231957.42+584446.2 (shown as red circles in Figure 14) is broad, with a slope of α IR ∼ −0.37 at λ = 2.2 µm. It is consistent with a YSO that is surrounded by hot circumstellar materials, in which the SED of the latter is superposed on that of the stellar black body (André 2011;Castro 2013), known as a Class II YSO (André 2011).…”

Section: Anomalies Inconsistent With Evolved Starssupporting

confidence: 69%

Searching for Anomalies in the ZTF Catalog of Periodic Variable Stars

Chan,

Villar,

Cheung

et al. 2021

Preprint

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Periodic variables illuminate the physical processes of stars throughout their lifetime. Wide-field surveys continue to increase our discovery rates of periodic variable stars. Automated approaches are essential to identify interesting periodic variable stars for multi-wavelength and spectroscopic followup. Here, we present a novel unsupervised machine learning approach to hunt for anomalous periodic variables using phase-folded light curves presented in the Zwicky Transient Facility Catalogue of Periodic Variable Stars by Chen et al. (2020). We use a convolutional variational autoencoder to learn a low dimensional latent representation, and we search for anomalies within this latent dimension via an isolation forest. We identify anomalies with irregular variability. Most of the top anomalies are likely highly variable Red Giants or Asymptotic Giant Branch stars concentrated in the Milky Way galactic disk; a fraction of the identified anomalies are more consistent with Young Stellar Objects. Detailed spectroscopic follow-up observations are encouraged to reveal the nature of these anomalies.

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