Search Publications
Hinode/EIS Coronal Magnetic Field Measurements at the Onset of a C2 Flare
Landi, E.; Li, W.; Hutton, R. +1 more
We study Hinode/EIS observations of an active region taken before, during, and after a small C2.0 flare in order to monitor the evolution of the magnetic field and its relation to the flare event. We find that while the flare left the active region itself unaltered, the event included a large magnetic field enhancement (MFE), which consisted of a …
The kinematics and dark matter fractions of TNG50 galaxies at z = 2 from an observational perspective
Übler, Hannah; Price, Sedona H.; Genel, Shy +13 more
We contrast the gas kinematics and dark matter contents of z = 2 star-forming galaxies (SFGs) from state-of-the-art cosmological simulations within the ΛCDM framework to observations. To this end, we create realistic mock observations of massive SFGs ( $M_*\gt 4\times 10^{10} \, \mathrm{M}_{\odot}$ , SFR >50 M⊙ yr-1) from …
Kiloparsec-scale AGN outflows and feedback in merger-free galaxies
Simmons, B. D.; Smethurst, R. J.; Coil, A. +7 more
Recent observations and simulations have challenged the long-held paradigm that mergers are the dominant mechanism driving the growth of both galaxies and supermassive black holes (SMBH), in favour of non-merger (secular) processes. In this pilot study of merger-free SMBH and galaxy growth, we use Keck Cosmic Web Imager spectral observations to ex…
Global Distribution of the Solar Wind Speed Reconstructed from Improved Tomographic Analysis of Interplanetary Scintillation Observations between 1985 and 2019
Kojima, Masayoshi; Tokumaru, Munetoshi; Fujiki, Ken'ichi +1 more
Computer-assisted tomography (CAT) for interplanetary scintillation (IPS) observations enables the determination of the global distribution of solar wind speed. We compared solar wind speeds derived from the CAT analysis of IPS observations between 1985 and 2019 with in situ observations conducted by the near-Earth and Ulysses spacecraft. From thi…
Host Star Metallicity of Directly Imaged Wide-orbit Planets: Implications for Planet Formation
Manoj, P.; Narang, Mayank; Swastik, C. +4 more
Directly imaged planets (DIPs) are self-luminous companions of pre-main-sequence and young main-sequence stars. They reside in wider orbits (∼tens to thousands of astronomical units) and generally are more massive compared to the close-in (≲10 au) planets. Determining the host star properties of these outstretched planetary systems is important to…
Spectroscopy and Photometry of the Least Massive Type II Globular Clusters: NGC 1261 and NGC 6934
Da Costa, G. S.; Milone, A. P.; Cordoni, G. +10 more
Recent work has revealed two classes of globular clusters (GCs), dubbed Type I and Type II. Type II GCs are characterized by both a blue and a red red giant branch composed of stars with different metallicities, often coupled with distinct abundances in the slow neutron-capture elements (s-elements). Here we continue the chemical tagging of Type I…
Resolving the Dust-to-Metals Ratio and CO-to-H2 Conversion Factor in the Nearby Universe
Sandstrom, Karin M.; Leroy, Adam K.; Schruba, Andreas +8 more
We investigate the relationship between the dust-to-metals ratio (D/M) and the local interstellar medium environment at ∼2 kpc resolution in five nearby galaxies: IC 342, M31, M33, M101, and NGC 628. A modified blackbody model with a broken power-law emissivity is used to model the dust emission from 100 to 500 µm observed by Herschel. We ut…
The Spitzer/IRAC Legacy over the GOODS Fields: Full-depth 3.6, 4.5, 5.8, and 8.0 µm Mosaics and Photometry for >9000 Galaxies at z 3.5-10 from the GOODS Reionization Era Wide-area Treasury from Spitzer (GREATS)
Franx, Marijn; Illingworth, Garth D.; Labbé, Ivo +9 more
We present the deepest Spitzer/InfraRed Array Camera (IRAC) 3.6, 4.5, 5.8, and 8.0 µm wide-area mosaics yet over the Great Observatories Origins Deep Survey (GOODS)-N and GOODS-S fields as part of the GOODS Reionization Era wide-Area Treasury from Spitzer (GREATS) project. We reduced and mosaicked in a self-consistent way observations taken …
Grain Growth in Escaping Atmospheres: Implications for the Radius Inflation of Super-Puffs
Ohno, Kazumasa; Tanaka, Yuki A.
Super-puffs-low-mass exoplanets with extremely low bulk density-are attractive targets for exploring their atmospheres and formation processes. Recent studies suggested that the large radii of super-puffs may be caused by atmospheric dust entrained in the escaping atmospheres. In this study, we investigate how the dust grows in escaping atmosphere…
HL Dra: an active Algol-like binary system with a pulsating component star and a cool third body
Shi, Xiang-dong; Qian, Sheng-bang; Li, Lin-jia +1 more
HL Draconis (HL Dra) is an oscillating eclipsing binary with an orbital period of 0.944276 d. By analysing the light curves observed with the Transiting Exoplanet Survey Satellite (TESS), it has been detected that HL Dra is an Algol-like binary system with a mass ratio of 0.361, where the radius filling factor (=r/RL) of the primary and…