Search Publications
Possible Evidence for Shear-driven Kelvin-Helmholtz Instability along the Boundary of Fast and Slow Solar Wind in the Corona
Telloni, Daniele; Zank, Gary P.; Adhikari, Laxman +5 more
This paper reports the first possible evidence for the development of the Kelvin-Helmholtz (KH) instability at the border of coronal holes separating the associated fast wind from the slower wind originating from adjacent streamer regions. Based on a statistical data set of spectroscopic measurements of the UV corona acquired with the UltraViolet …
A Submillimeter Perspective on the GOODS Fields (SUPER GOODS). V. Deep 450 µm Imaging
Barger, A. J.; Cowie, L. L.; Jones, L. H. +1 more
We present deep SCUBA-2 450 µm imaging of the two GOODS fields, achieving a central rms of 1.14 mJy for the GOODS-N and 1.86 mJy for the GOODS-S. For each field, we give a catalog of >4σ detections (79 and 16 sources, respectively). We construct the 450 µm number counts, finding excellent agreement with others from the literature. W…
MiMO: Mixture Model for Open Clusters in Color-Magnitude Diagrams
Li, Lu; Shao, Zhengyi
We propose a mixture model of open clusters (OCs) in color-magnitude diagrams (CMDs) to measure the OC properties, including isochrone parameters (age, distance, metallicity, and dust extinction), stellar mass function (MF), and binary parameters (binary fraction and mass-ratio distribution), with high precision and reliability. The model treats a…
ALMA Observations of Molecular Complexity in the Large Magellanic Cloud: The N 105 Star-forming Region
Tokuda, Kazuki; Onishi, Toshikazu; Kurtz, Stan E. +18 more
The Large Magellanic Cloud (LMC) is the nearest laboratory for detailed studies on the formation and survival of complex organic molecules (COMs), including biologically important ones, in low-metallicity environments-typical of earlier cosmological epochs. We report the results of 1.2 mm continuum and molecular line observations of three fields i…
Detectability of Black Hole Binaries with Gaia: Dependence on Binary Evolution Models
Shikauchi, Minori; Tanikawa, Ataru; Kawanaka, Norita
The astrometric satellite Gaia is expected to observe noninteracting black hole (BH) binaries with luminous companions (LCs; hereafter BH-LC binaries), a different population from BH X-ray binaries previously discovered. The detectability of BH-LC binaries with Gaia might be dependent on binary evolution models. We investigated the Gaia's detectab…
Identification and Spectroscopic Characterization of 128 New Herbig Stars
Panić, Olja; Pérez-Martínez, Ricardo; Oudmaijer, René D. +6 more
We present optical spectroscopy observations of 145 high-mass pre-main-sequence candidates from the catalog of Vioque et al. 2020 From these, we provide evidence for the Herbig nature of 128 sources. This increases the number of known objects of the class by ~50%. We determine the stellar parameters of these sources using the spectra and Gaia EDR3…
NEID Rossiter-McLaughlin Measurement of TOI-1268b: A Young Warm Saturn Aligned with Its Cool Host Star
Torres, Guillermo; Vanderburg, Andrew; Rampalli, Rayna +56 more
Close-in gas giants present a surprising range of stellar obliquity, the angle between a planet's orbital axis and its host star's spin axis. It is unclear whether the obliquities reflect the planets' dynamical history (e.g., aligned for in situ formation or disk migration versus misaligned for high-eccentricity tidal migration) or whether other m…
SolO/EUI Observations of Ubiquitous Fine-scale Bright Dots in an Emerging Flux Region: Comparison with a Bifrost MHD Simulation
Tiwari, Sanjiv K.; De Pontieu, Bart; Berghmans, David +2 more
We report on the presence of numerous tiny bright dots in and around an emerging flux region (an X-ray/coronal bright point) observed with SolO's EUI/HRIEUV in 174 Å. These dots are roundish and have a diameter of 675 ± 300 km, a lifetime of 50 ± 35 s, and an intensity enhancement of 30% ± 10% above their immediate surroundings. About h…
Typhon: A Polar Stream from the Outer Halo Raining through the Solar Neighborhood
Martin, Nicolas; Famaey, Benoit; Viswanathan, Akshara +5 more
We report on the discovery in the Gaia DR3 astrometric and spectroscopic catalog of a new polar stream that is found as an overdensity in action space. This structure is unique as it has an extremely large apocenter distance, reaching beyond 100 kpc, and yet is detected as a coherent moving structure in the solar neighborhood with a width of ~4 kp…
The Accretion Flow Geometry of MAXI J1820+070 through Broadband Noise Research with Insight Hard X-ray Modulation Telescope
Zhang, S.; Bu, Qing-Cui; Zhang, Liang +25 more
Here we present a detailed study of the broadband noise in the power density spectra of the black hole X-ray binary MAXI J1820+070 during the hard state of its 2018 outburst, using Hard X-ray Modulation Telescope observations. The broadband noise shows two main humps, which might separately correspond to variability from a variable disk and two Co…