Search Publications
Fundamental effective temperature measurements for eclipsing binary stars - IV. Selection of new benchmark stars and first results for HD 22064
Maxted, Pierre F. L.
I describe the selection and initial characterization of 20 eclipsing binary stars that are suitable for calibration and testing of stellar models and data analysis algorithms used by the PLATO mission and spectroscopic surveys. The binary stars selected are F-/G-type dwarf stars with M-type dwarf companions that contribute less than 2 per cent of…
The Type II-P Supernova 2019mhm and Constraints on its Progenitor System
Rest, A.; Foley, R. J.; Kilpatrick, C. D. +4 more
We present pre- and postexplosion observations of the Type II-P supernova (SN II-P) 2019mhm located in NGC 6753. Based on optical spectroscopy and photometry, we show that SN 2019mhm exhibits broad lines of hydrogen with a velocity of -8500 ± 200 km s-1 and a 111 ± 2 day extended plateau in its luminosity, typical of the Type II-P subcl…
The Most Sensitive SETI Observations Toward Barnard's Star with FAST
Tao, Zhen-Zhao; Zhao, Hai-Chen; Zhang, Tong-Jie +4 more
Search for extraterrestrial intelligence (SETI) has been mainly focused on nearby stars and their planets in recent years. Barnard's star is the second closest star system to the Sun and the closest star in the Five-hundred-meter Aperture Spherical radio Telescope (FAST) observable sky which makes the minimum Equivalent Isotropic Radiated Power re…
Global Spatial Distribution of Hack's Law Exponent on Mars Consistent With Early Arid Climate
Luo, W.; Howard, A. D.; Craddock, R. A. +2 more
Widespread valley networks (VNs) on Mars and other evidence point to an early warm and wet climate. However, ongoing debates still exist about VN's formation processes and associated climatic conditions. The power law relationship between basin length and area (Hack's Law) can be diagnostic of different fluvial processes related to climatic condit…
Circumgalactic Medium at High Halo Masses-Signatures of Cold Gas Depletion in Luminous Red Galaxies
Smailagić, Marijana; Prochaska, Jason Xavier; Burchett, Joseph +1 more
We study ultraviolet H I and metal-line transitions in the circumgalactic medium (CGM) of 15 massive, quenched luminous red galaxies (LRGs) at redshift z ~ 0.5 and with impact parameters up to 400 kpc. We selected eight LRG-CGM systems to study general properties of the CGM around LRGs, while the other seven are already known to contain cool CGM g…
The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. VI. The Star Formation History and Dust Production in Andromeda IX
Abdollahi, Hedieh; Javadi, Atefeh; Mirtorabi, Mohammad Taghi +9 more
We present a photometric study of the resolved stellar populations in Andromeda IX (And IX), the closest satellite to M31, a metal-poor and low-mass dwarf spheroidal galaxy. We estimate a distance modulus of ${24.56}_{-0.15}^{+0.05}$ mag based on the tip of the red giant branch. By probing the variability of asymptotic giant branch stars, we study…
A possible dwarf galaxy satellite-of-satellite problem in ΛCDM
Müller, Oliver; Heesters, Nick; Jerjen, Helmut +2 more
Dark matter clusters on all scales, and it is therefore expected that even substructure should host its own substructure. Using the Extragalactic Distance Database, we searched for dwarf-galaxy satellites of dwarf galaxies, that is, satellite-of-satellite galaxies, corresponding to these substructures of substructure. From investigation of Hubble …
CO Excitation in High-z Main-sequence Analogues: Resolved CO(4-3)/CO(3-2) Line Ratios in DYNAMO Galaxies
Glazebrook, Karl; Lenkić, Laura; Bolatto, Alberto D. +6 more
The spectral line energy distribution of carbon monoxide contains information about the physical conditions of the star-forming molecular hydrogen gas; however, the relation to local radiation field properties is poorly constrained. Using ~1-2 kpc scale Atacama Large Millimeter Array observations of CO(3-2) and CO(4-3), we characterize the CO(4-3)…
Cold molecular gas outflow encasing the ionized one in the Seyfert galaxy NGC 3281
Storchi-Bergmann, Thaisa; Riffel, Rogemar A.; Morganti, Raffaella +2 more
We present ALMA CO (2-1) observations of the Seyfert 2 galaxy NGC 3281 at ~100 pc spatial resolution. This galaxy was previously known to present a bi-conical ionized gas outflow extending to 2 kpc from the nucleus. The analysis of the CO moment and channel maps, as well as kinematic modelling, reveals two main components in the molecular gas: one…
DMPP-4: candidate sub-Neptune mass planets orbiting a naked-eye star
Anglada-Escudé, G.; Fossati, L.; Llama, J. +9 more
We present radial velocity measurements of the very bright (V ~ 5.7) nearby F star, DMPP-4 (HD 184960). The anomalously low Ca II H&K emission suggests mass-loss from planets orbiting a low activity host star. Periodic radial velocity variability with ~10 m s-1 amplitude is found to persist over a >4 yr time-scale. Although the n…