Search Publications
DECaPS and SMA Discovery of a Highly Inclined Class I Young Stellar Object with an Outflow: IRAS 08235–4316
Wilner, David J.; Rao, Ramprasad; Edenhofer, Gordian +4 more
We present images of IRAS 08235–4316 with the Dark Energy Camera Plane Survey (DECaPS; spanning 0.398–1.034 µm, at ∼1″ resolution) and the Submillimeter Array (SMA; at 1.38 mm (217 GHz) and ∼1
Disk in the Circumstellar Envelope of Carbon Mira V Cygni
Strakhov, Ivan A.; Shenavrin, Victor I.; Safonov, Boris S. +2 more
Asymptotic giant branch (AGB) stars are the primary source of dust and complex molecules in the interstellar medium. The determination of outflow parameters is often hindered by the unknown geometry of the circumstellar environment, creating a demand for high-angular resolution observations. We use our near-infrared spectra and photometry of the c…
Evolved Massive Stars at Low Metallicity. VI. Mass-loss Rate of Red Supergiant Stars in the Large Magellanic Cloud
Yang, Ming; Gao, Jian; Ren, Yi +4 more
Mass loss is a crucial process that affects the observational properties, evolution path, and fate of highly evolved stars. However, the mechanism of mass loss is still unclear, and the mass-loss rate (MLR) of red supergiant stars (RSGs) requires further research and precise evaluation. To address this, we utilized an updated and complete sample o…
JWST-TST High Contrast: Spectroscopic Characterization of the Benchmark Brown Dwarf HD 19467 B with the NIRSpec Integral Field Spectrograph
van der Marel, Roeland P.; Perrin, Marshall D.; Pueyo, Laurent +14 more
We present the atmospheric characterization of the substellar companion HD 19467 B as part of the pioneering James Webb Space Telescope Guaranteed Time Observer program to obtain moderate resolution spectra (R ∼ 2700, 3–5 µm) of a high-contrast companion with the NIRSpec integral field unit (IFU). HD 19467 B is an old, ∼9 Gyr, companion to a…
Candidate Main-belt Asteroids for Surface Heterogeneity
Hasegawa, Sunao; Marsset, Michaël; Bus, Schelte J. +10 more
Large terrestrial bodies in our solar system like the Earth, Mars, Mercury, and the Moon exhibit geologically complex surfaces with compositional heterogeneity. From past studies using large telescopes and spacecraft, it was shown that asteroids with diameters larger than 100 km also show surface heterogeneity at hemispheric scales, while on small…
Frequencies of Warm Debris Disks Based on Point Source Catalogs of Spitzer, WISE, and Gaia
Momose, Munetake; Mizuki, Toshiyuki; Aizawa, Masataka +1 more
More than a thousand warm debris disks have been detected as infrared excess at mid-infrared wavelengths, and their frequencies have been obtained for various spectral types of stars. However, the dependence of the frequencies on spectral type is still debated because the number of stars with significant and detectable infrared excess is limited. …
Haro 5-2: A New Pre-main-sequence Quadruple Stellar System
Flores, C.; Geballe, T. R.; Reipurth, Bo +9 more
We have discovered that the Hα emission-line star Haro 5-2, located in the 3–6 Myr old Ori OB1b association, is a young quadruple system. The system has a 2+2 configuration, with an outer separation of 2.″6 and with resolved subarcsecond inner binary components. The brightest component, Aa, dominates the A-binary; it is a weak-line T Tauri star wi…
Gemini Planet Imager Observations of a Resolved Low-inclination Debris Disk around HD 156623
Crotts, Katie A.; Matthews, Brenda C.; Duchêne, Gaspard +12 more
The 16 Myr old A0V star HD 156623 in the Scorpius–Centaurus association hosts a high-fractional-luminosity debris disk, recently resolved in scattered light for the first time by the Gemini Planet Imager (GPI) in polarized intensity only. We present a new analysis of the GPI H-band polarimetric detection of the HD 156623 debris disk, with particul…
Metallicity-PAH Relation of MIR-selected Star-forming Galaxies in AKARI North Ecliptic Pole-wide Survey
Hashimoto, Tetsuya; Jeong, Woong-Seob; Hwang, Ho Seong +9 more
We investigate the variation in the mid-infrared spectral energy distributions of 373 low-redshift (z < 0.4) star-forming galaxies, which reflects a variety of polycyclic aromatic hydrocarbon (PAH) emission features. The relative strength of PAH emission is parameterized as q PAH, which is defined as the mass fraction of PAH particle…
Young Stellar Object Candidates in IC 417
Rebull, L. M.; Hall, G.; Anderson, R. L. +12 more
IC 417 is in the Galactic plane, and likely part of the Aur OB2 association; it is ~2 kpc away. Stock 8 is one of the densest cluster constituents; off of it to the east, there is a "nebulous stream" (NS) that is dramatic in the infrared (IR). We have assembled a list of literature-identified young stellar objects (YSOs), new candidate YSOs from t…