Search Publications
New Variable Hot Subdwarf Stars Identified from Anomalous Gaia Flux Errors, Observed by TESS, and Classified via Fourier Diagnostics
Hermes, J. J.; Lopez, Isaac D.; Kupfer, Thomas +7 more
Hot subdwarf stars are mostly stripped red giants that can exhibit photometric variations due to stellar pulsations, eclipses, the reflection effect, ellipsoidal modulation, and Doppler beaming. Detailed studies of their light curves help constrain stellar parameters through asteroseismological analyses or binary light-curve modeling and generally…
Bridging Optical and Far-infrared Emission-line Diagrams of Galaxies from Local to the Epoch of Reionization: Characteristic High [O III] 88 µm/SFR at z > 6
Harikane, Yuichi; Inoue, Akio K.; Hashimoto, Takuya +3 more
We present photoionization modeling of galaxy populations at z ∼ 0, 2, and >6 to bridge optical and far-infrared (FIR) emission-line diagrams. We collect galaxies with measurements of optical and/or FIR ([O III] 88 µm and [C II] 158 µm) emission-line fluxes and plot them on the [O III]λ5007/Hβ-[N II]λ6585/Hα (BPT) and L([O III]…
Disk Evolution Study through Imaging of Nearby Young Stars (DESTINYS): A Panchromatic View of DO Tau's Complex Kilo-astronomical-unit Environment
Ménard, François; Bae, Jaehan; Bergin, Edwin A. +20 more
While protoplanetary disks are often treated as isolated systems in planet formation models, observations increasingly suggest that vigorous interactions between Class II disks and their environments are not rare. DO Tau is a T Tauri star that has previously been hypothesized to have undergone a close encounter with the HV Tau system. As part of t…
The SOFIA FEEDBACK Legacy Survey Dynamics and Mass Ejection in the Bipolar H II Region RCW 36
Schneider, N.; Zavagno, A.; Stutzki, J. +20 more
We present [C II] 158 µm and [O I] 63 µm observations of the bipolar H II region RCW 36 in the Vela C molecular cloud, obtained within the SOFIA legacy project FEEDBACK, which is complemented with APEX 12/13CO (3-2) and Chandra X-ray (0.5-7 keV) data. This shows that the molecular ring, forming the waist of the bipolar nebul…
The DR21(OH) Trident-Resolving the Massive Ridge into Three Entangled Fibers as the Initial Condition of Cluster Formation
Qiu, Keping; Li, Guang-Xing; Cao, Yue +1 more
DR21(OH) ridge, the central part of a high-mass star- and cluster-forming hub-filament system, is resolved spatially and kinematically into three nearly parallel fibers (f1, f2, and f3) with a roughly north-south orientation, using the observations of molecular transitions of H13CO+ (1 - 0), N2H+ (1 - 0)…
Unraveling the Observational Signatures of Cloud-Cloud Collision and Hub-filament Systems in W31
Dewangan, L. K.; Fukui, Y.; Sano, H. +3 more
To understand the formation process of massive stars, we present a multiscale and multiwavelength study of the W31 complex hosting two extended H II regions (i.e., G10.30-0.15 (hereafter, W31-N) and G10.15-0.34 (hereafter, W31-S)) powered by a cluster of O-type stars. Several Class I protostars and a total of 49 ATLASGAL 870 µm dust clumps (…
The Role of Disk Tearing and Precession in the Observed Variability of Pleione
Carciofi, A. C.; Tycner, C.; Jones, C. E. +2 more
We acquired Hα spectroscopic observations from 2005 to 2019 showing Pleione has transitioned from a Be phase to a Be-shell phase during this period. Using the radiative transfer code HDUST, we created a grid of ~100,000 disk models for Pleione. We successfully reproduced the observed transition with a disk model that varies in inclination while ma…
The MASSIVE Survey. XVII. A Triaxial Orbit-based Determination of the Black Hole Mass and Intrinsic Shape of Elliptical Galaxy NGC 2693
Ma, Chung-Pei; Greene, Jenny E.; Blakeslee, John P. +5 more
We present a stellar dynamical mass measurement of a newly detected supermassive black hole (SMBH) at the center of the fast-rotating, massive elliptical galaxy NGC 2693 as part of the MASSIVE survey. We combine high signal-to-noise ratio integral field spectroscopy (IFS) from the Gemini Multi-Object Spectrograph with wide-field data from the Mitc…
Quasiperiodic Behavior in the γ-Ray Light Curve of the Blazar PKS 0405-385
Gong, Yunlu; Yuan, Min; Yi, Tingfeng +3 more
We analyze the quasiperiodic oscillation (QPO) of the historical light curve of flat-spectrum radio quasars PKS 0405-385 detected by the Fermi Large Area Telescope from 2008 August to 2021 November. To identify and determine the QPO signal of PKS 0405-385 in the γ-ray light curve, we use four time series analysis techniques based on frequency and …
What Are Those Tiny Things? A First Study of Compact Star Clusters in the SMACS0723 Field with JWST
Brammer, Gabriel; Toft, Sune; Faisst, Andreas L. +1 more
We use the unprecedented resolution and depth of the JWST NIRCam Early Release Observations at 1-5 µm to study the stellar mass, age, and metallicity of compact star clusters in the neighborhood of the host galaxies in the SMACS J0723.3-7327 galaxy cluster field at z = 0.39. The measured colors of these star clusters show a similar distribut…