Search Publications
Probing the Galactic halo with RR Lyrae stars - IV. On the Oosterhoff dichotomy of RR Lyrae stars
Tian, Haijun; Liu, Gaochao; Huang, Yang +8 more
We use 3653 (2661 RRab, 992 RRc) RR Lyrae stars (RRLs) with 7D (3D position, 3D velocity, and metallicity) information selected from Sloan Digital Sky Survey, Large Sky Area Multi-Object Fiber Spectroscopic Telescope, and Gaia EDR3, and divide the sample into two Oosterhoff groups (Oo I and Oo II) according to their amplitude-period behaviour in t…
The Pristine survey - XX. GTC follow-up observations of extremely metal-poor stars identified from Pristine and LAMOST
Sestito, Federico; Martin, Nicolas F.; Aguado, David S. +5 more
Ultra-metal-poor stars ($\rm {[Fe/H]} \lt -4.0$) are very rare, and finding them is a challenging task. Both narrow-band photometry and low-resolution spectroscopy have been useful tools for identifying candidates, and in this work, we combine both approaches. We cross-matched metallicity-sensitive photometry from the Pristine survey with the low-…
A survey for variable young stars with small telescopes: VI - Analysis of the outbursting Be stars NSW 284, gaia 19eyy, and VES 263
De, Kishalay; Hillenbrand, Lynne A.; Eislöffel, Jochen +44 more
This paper is one in a series reporting results from small telescope observations of variable young stars. Here, we study the repeating outbursts of three likely Be stars based on long-term optical, near-infrared, and mid-infrared photometry for all three objects, along with follow-up spectra for two of the three. The sources are characterized as …
Thermal emission from the hot Jupiter WASP-103 b in J and Ks bands
Henning, Thomas; Zhao, Gang; Wang, Wei +9 more
Hot Jupiters, particularly those with temperature higher than 2000 K, are the best sample of planets that allow in-depth characterization of their atmospheres. We present here a thermal emission study of the ultrahot Jupiter WASP-103 b observed in two secondary eclipses with CFHT/WIRCam in J and Ks bands. By means of high precision diff…
Exploring the potential of Twinkle to unveil the nature of LTT 1445 Ab
Gaudi, B. Scott; Wang, Ji; Phillips, Caprice L. +3 more
We explore the prospects for Twinkle to determine the atmospheric composition of the nearby terrestrial-like planet LTT 1445 Ab, including the possibility of detecting the potential biosignature ammonia (NH3). At a distance of 6.9 pc, this system is the second closest known transiting system and will be observed through transmission spe…
3D radiative transfer modelling and virial analysis of starless cores in the B10 region of the Taurus molecular cloud
Caselli, Paola; Shirley, Yancy; Singh, Ayushi +4 more
Low-mass stars like our Sun begin their evolution within cold (10 K) and dense (~105 cm-3) cores of gas and dust. The physical structure of starless cores is best probed by thermal emission of dust grains. We present a high-resolution dust continuum study of the starless cores in the B10 region of the Taurus Molecular Cloud. …
Determination of dynamical ages of open clusters through the A+ parameter - II
Vaidya, Kaushar; Rao, Khushboo K.; Agarwal, Manan +2 more
Blue straggler stars (BSS), one of the most massive members of star clusters, have been used for over a decade to investigate mass segregation and estimate the dynamical ages of globular clusters (GCs) and open clusters (OCs). This work is an extension of our previous study, in which we investigated a correlation between theoretically estimated dy…
A deep dive: Chandra observations of the NGC 4839 group falling into the Coma cluster
Walker, S. A.; Mirakhor, M. S.; Runge, J.
Cosmological simulations of structure formation predict that galaxy clusters continue to grow and evolve through ongoing mergers with group-scale systems. During these merging events, the ram pressure applied by the intracluster medium acts to strip the gas from the infalling groups, forming large tails of stripped gas, which eventually become par…
The XMM cluster survey: exploring scaling relations and completeness of the dark energy survey year 3 redMaPPer cluster catalogue
Bacon, D.; Smith, M.; Allam, S. +67 more
We cross-match and compare characteristics of galaxy clusters identified in observations from two sky surveys using two completely different techniques. One sample is optically selected from the analysis of 3 years of Dark Energy Survey observations using the redMaPPer cluster detection algorithm. The second is X-ray selected from XMM observations…
Are Milky-Way-like galaxies like the Milky Way? A view from SDSS-IV/MaNGA
Merrifield, Michael; Aragón-Salamanca, Alfonso; Drory, Niv +3 more
In this paper, we place the Milky Way (MW) in the context of similar-looking galaxies in terms of their star-formation and chemical evolution histories. We select a sample of 138 Milky Way analogues (MWAs) from the SDSS-IV/MaNGA survey based on their masses, Hubble types, and bulge-to-total ratios. To compare their chemical properties to the detai…