Search Publications
Raman mapping of photodissociation regions
Henney, William J.
Broad Raman-scattered wings of hydrogen lines can be used to map neutral gas illuminated by high-mass stars in star-forming regions. Raman scattering transforms far-ultraviolet starlight from the wings of the Lyβ line (1022-1029 Å) to red visual light in the wings of the Hα line (6400 -6700 Å). Analysis of spatially resolved spectra of the Orion B…
Nigraha: Machine-learning-based pipeline to identify and evaluate planet candidates from TESS
Mahabal, Ashish; Rao, Sriram; Rao, Niyanth +1 more
The Transiting Exoplanet Survey Satellite (TESS) has now been operational for a little over two years, covering the Northern and the Southern hemispheres once. The TESS team processes the downlinked data using the Science Processing Operations Center (SPOC) pipeline and Quick Look pipeline (QLP) to generate alerts for follow-up. Combined with othe…
Astrometric and Photometric Investigation of Three Old Age Open Clusters in the Gaia Era: Berkeley 32, Berkeley 98, and King 23
Bisht, D.; Yadav, R. K. S.; Rangwal, G. +2 more
Using the photometric and kinematical data from Gaia Data Release 2, three old open clusters namely Berkeley 32 (Be 32), Berkeley 98 (Be 98), and King 23 are investigated. The latter two of these clusters are poorly studied in the literature. The numbers of the most probable cluster members are 563, 260, and 114 for Be 32, Be 98, and King 23, resp…
Six Outbursts of Comet 46P/Wirtanen
Duev, Dmitry A.; Southworth, J.; Bellm, Eric C. +33 more
Cometary activity is a manifestation of sublimation-driven processes at the surface of nuclei. However, cometary outbursts may arise from other processes that are not necessarily driven by volatiles. In order to fully understand nuclear surfaces and their evolution, we must identify the causes of cometary outbursts. In that context, we present a s…
Searching for multiple populations in Ruprecht 106
Villanova, S.; Fernández-Trincado, J. G.; Muñoz, C. +1 more
More than a decade has passed since the definition of globular cluster (GC) changed, and now we know that they host multiple populations (MPs). But few GCs do not share that behaviour and Ruprecht 106 is one of these clusters. We analysed 13 member red giant branch stars using spectra in the wavelength range 6120-6405 Å obtained through the GIRAFF…
A case study of ACV variables discovered in the Zwicky Transient Facility survey
Paunzen, E.; Prišegen, M.; Faltová, N. +6 more
Context. Magnetic chemically peculiar (mCP) stars exhibit complex atmospheres that allow the investigation of the interplay of atomic diffusion, magnetic fields, and stellar rotation. A non-uniform surface distribution of chemical elements and the non-alignment of the rotational and magnetic axes result in the variability of several observables. P…
The Discovery of Two LISA Sources within 0.5 kpc
Kilic, Mukremin; Bédard, A.; Kosakowski, Alekzander +1 more
We report the discovery of the brightest detached binary white dwarfs with periods less than an hour, which provide two new gravitational-wave verification binaries for the Laser Interferometer Space Antenna (LISA). The first one, SMSS J033816.16-813929.9 (hereafter J0338), is a 30.6 minute orbital period, g = 17.2 mag detached double white dwarf …
The MAVERIC Survey: Variable Jet-accretion Coupling in Luminous Accreting Neutron Stars in Galactic Globular Clusters
Strader, Jay; Bahramian, Arash; Maccarone, Thomas J. +9 more
Accreting neutron stars in low-mass X-ray binaries show outflows-and sometimes jets-in the general manner of accreting black holes. However, the quantitative link between the accretion flow (traced by X-rays) and outflows and/or jets (traced by radio emission) is much less well understood for neutron stars than for black holes, other than the gene…
The 2175 Å Dust Feature in Star-forming Galaxies at 1.3 ≤ z ≤ 1.8: The Dependence on Stellar Mass and Specific Star Formation Rate
Kartaltepe, Jeyhan S.; Daddi, Emanuele; Kashino, Daichi +10 more
We present direct spectroscopic measurements of the broad 2175 Å absorption feature in 505 star-forming main-sequence galaxies at 1.3 ≤ z ≤ 1.8 using individual and stacked spectra from the zCOSMOS-deep survey. Significant 2175 Å excess absorption features of moderate strength are measured, especially in the composite spectra. The excess absorptio…
Gaia DR2 giants in the Galactic dust - I. Reddening across the whole dust layer and some properties of the giant clump
Gontcharov, George A.; Mosenkov, Aleksandr V.
We consider a complete sample of 101 810 giants with Gaia Data Realease 2 (DR2) parallaxes ϖ within the red clump domain of the Hertzsprung-Russell diagram in the space cylinder with a radius of 700 pc around the Sun and a height of |Z| = 1800 pc. We use the Gaia DR2 GBP, GRP, and Wide-field Infrared Survey Explorer W3 photom…