Search Publications
Investigation of the orbital period and mass relations for W UMa-type contact systems
Poro, A.; Sabbaghian, G.; Madayen, T. +14 more
New relationships between the orbital period and some parameters of W Ursae Majoris (W UMa)-type systems are presented in this study. To investigate the relationships, we calculated the absolute parameters of a sample of 118 systems. For this purpose, we used the parallax values obtained from the Gaia Early Data Release 3 star catalogue for more p…
What are the spectroscopic binaries with high-mass functions near the Gaia DR3 main sequence?
Rix, Hans-Walter; El-Badry, Kareem
The third data release of the Gaia mission includes orbital solutions for >105 single-lined spectroscopic binaries, representing more than an order of magnitude increase in sample size over all previous studies. This data set is a treasure trove for searches for quiescent black hole + normal star binaries. We investigate one populati…
Two-spacecraft detection of short-period decayless kink oscillations of solar coronal loops
Berghmans, David; Nakariakov, Valery M.; Verbeeck, Cis +2 more
Decayless kink oscillations of an ensemble of loops are captured simultaneously by the High Resolution Imager (HRI) of the Extreme Ultraviolet Imager (EUI) and the Atmospheric Imaging Assembly (AIA) from 22:58 UT on 2021 November 5 to 00:27 UT on 2021 November 6. Oscillations are analysed by processing image sequences taken by the two instruments …
Lenses In VoicE (LIVE): searching for strong gravitational lenses in the VOICE@VST survey using convolutional neural networks
Vaccari, Mattia; Koopmans, Léon V. E.; Fan, Zuhui +8 more
We present a sample of 16 likely strong gravitational lenses identified in the VST Optical Imaging of the CDFS and ES1 fields (VOICE survey) using convolutional neural networks (CNNs). We train two different CNNs on composite images produced by superimposing simulated gravitational arcs on real Luminous Red Galaxies observed in VOICE. Specifically…
Constraining SIDM with halo shapes: Revisited predictions from realistic simulations of early-type galaxies
Vogelsberger, Mark; Sparre, Martin; Zavala, Jesús +3 more
We study the effect of self-interacting dark matter (SIDM) and baryons on the shape of early-type galaxies (ETGs) and their dark matter haloes, comparing them to the predictions of the cold dark matter (CDM) scenario. We use five hydrodynamical zoom-in simulations of haloes hosting ETGs ($M_{\rm vir}\sim 10^{13}\, \mathrm{M}_{\odot }$ and $M_{*}\s…
The chemical abundance pattern of the extremely metal-poor thin disc star 2MASS J1808-5104 and its origins
Placco, Vinicius M.; Meléndez, Jorge; Roederer, Ian U. +6 more
We present a high-resolution (R ~ 35 000), high signal-to-noise (S/N = 350) Magellan/MIKE spectrum of the bright extremely metal-poor star 2MASS J1808-5104. We find [Fe/H] = -4.01 (spectroscopic LTE stellar parameters), [Fe/H] = -3.8 (photometric stellar parameters), and [Fe/H] = -3.7 (spectroscopic NLTE stellar parameters). We measured a carbon-t…
An environmental analysis of the Type Ib SN 2019yvr and the possible presence of an inflated binary companion
Sun, Ning-Chen; Crowther, Paul A.; Zapartas, Emmanouil +5 more
SN 2019yvr is the second Type Ib supernova (SN) with a possible direct detection of its progenitor (system); however, the spectral energy distribution (SED) of the pre-explosion source appears much cooler and overluminous than an expected helium-star progenitor. Using Hubble Space Telescope (HST) images and MUSE integral-field-unit (IFU) spectrosc…
A 1.46-2.48 µm spectroscopic atlas of a T6 dwarf (1060 K) atmosphere with IGRINS: first detections of H2S and H2, and verification of H2O, CH4, and NH3 line lists
Fortney, Jonathan J.; Metchev, Stanimir; Morley, Caroline V. +5 more
We present Gemini South/IGRINS observations of the 1060 K T6 dwarf 2MASS J08173001-6155158 with unprecedented resolution ($R\equiv \lambda /\Delta \lambda =45\, 000$) and signal-to-noise ratio (S/N > 200) for a late-type T dwarf. We use this benchmark observation to test the reliability of molecular line lists used up-to-date atmospheric models…
Clusters of galaxies up to z = 1.5 identified from photometric data of the Dark Energy Survey and unWISE
Han, J. L.; Wen, Z. L.
Using photometric data from the Dark Energy Survey and the Wide-field Infrared Survey Explorer, we estimate photometric redshifts for 105 million galaxies using the nearest-neighbour algorithm. From such a large data base, 151 244 clusters of galaxies are identified in the redshift range of 0.1 < z ≲ 1.5 based on the overdensity of the total st…
Origin of highly r-process-enhanced stars in a cosmological zoom-in simulation of a Milky Way-like galaxy
Beers, Timothy C.; Hirai, Yutaka; Saitoh, Takayuki R. +5 more
The r-process-enhanced (RPE) stars provide fossil records of the assembly history of the Milky Way (MW) and the nucleosynthesis of the heaviest elements. Observations by the R-Process Alliance (RPA) and others have confirmed that many RPE stars are associated with chemo-dynamically tagged groups, which likely came from accreted dwarf galaxies of t…