Search Publications
Multi-epoch hard X-ray view of Compton-thick AGN Circinus Galaxy
Gandhi, Poshak; Ricci, Claudio; Kayal, Abhijit +4 more
The circumnuclear material around active galactic nuclei (AGNs) is one of the essential components of the obscuration-based unification model. However, our understanding of the circumnuclear material in terms of its geometrical shape, structure, and its dependence on accretion rate is still debated. In this paper, we present the multi-epoch broad-…
Discovery and characterization of two Neptune-mass planets orbiting HD 212729 with TESS
Torres, Guillermo; Latham, David W.; Wheatley, Peter J. +33 more
We report the discovery of two exoplanets orbiting around HD 212729 (TOI 1052, TIC 317060587), a Teff = 6146 K star with V = 9.51 observed by TESS in Sectors 1 and 13. One exoplanet, TOI-1052b, is Neptune-mass and transits the star, and an additional planet TOI-1052c is observed in radial velocities but not seen to transit. We confirm t…
Asteroseismology of PG 1541 + 651 and BPM 31594 with TESS
Kepler, S. O.; Hermes, J. J.; Bell, Keaton J. +5 more
We present the photometric data from TESS for two known ZZ Ceti stars, PG 1541 + 651 and BPM 31594. Before TESS, both objects only had observations from short runs from ground-based facilities, with three and one period detected, respectively. The TESS data allowed the detection of multiple periodicities, 12 for PG 1541 + 651, and six for BPM 3159…
Study of the open clusters in Kepler prime field
Akkaya Oralhan, İnci; Netopil, Martin; Çakmak, Hikmet +3 more
We present a detailed study of NGC 6791, NGC 6811, NGC 6819, and NGC 6866, the four open clusters that are located in the Kepler prime field. We use new CCD UBV(RI)KC photometry, which was combined with Gaia EDR3 photometric/astrometric data, to derive the astrophysical parameters with two-independent methods - one of them the fitCMD al…
High-throughput quantum chemistry: empowering the search for molecular candidates behind unknown spectral signatures in exoplanetary atmospheres
McKemmish, Laura K.; Pettyjohn, Maria M.; Zapata Trujillo, Juan C.
The identification of molecules in exoplanetary atmospheres is only possible thanks to the availability of high-resolution molecular spectroscopic data. However, due to its intensive and time-consuming generation process, at present, only 100 molecules have high-resolution spectroscopic data available, limiting new molecular detections. Using rout…
Ups!... I did it again: unveiling the hidden companion in Upsilon Sagittarii, a unique binary system at a second mass transfer stage
Shenar, Tomer; Gilkis, Avishai
Upsilon Sagittarii is a hydrogen-deficient binary that has been suggested to be in its second stage of mass transfer, after the primary has expanded to become a helium supergiant following core helium exhaustion. A tentative identification of the faint companion in the ultraviolet led to mass estimates of both components that made the helium star …
Multiple gas phases in supernova remnant IC 443: mapping shocked H2 with VLT/KMOS
Fang, Min; Chen, Zhiwei; Bian, Fuyan +8 more
Supernovae and their remnants provide energetic feedback to the ambient interstellar medium (ISM), which is often distributed in multiple gas phases. Among them, warm molecular hydrogen (H2) often dominates the cooling of the shocked molecular ISM, which has been observed with the H2 emission lines at near-infrared wavelength…
Discovery of extraordinary X-ray emission from magnetospheric interaction in the unique binary stellar system ϵ Lupi
Corcoran, M. F.; Leutenegger, M. A.; Wade, G. A. +12 more
We report detailed X-ray observations of the unique binary system ϵ Lupi, the only known short-period binary consisting of two magnetic early-type stars. The components have comparably strong, but anti-aligned magnetic fields. The orbital and magnetic properties of the system imply that the magnetospheres overlap at all orbital phases, suggesting …
Modelling of the processes of dunes formation on the surface of comet 67P/Churyumov-Gerasimenko
Wesołowski, Marcin
The paper discusses selected mechanisms that can significantly contribute to the formation of dune structures on the surface of comets. In these considerations, mechanisms related to the dynamics of dust on the surface of the nucleus were taken into account. In the first step, the maximum dimensions of particles that can be entrained into the come…
Unveiling the gravitationally unstable disc of a massive star-forming galaxy using NOEMA and MUSE
Cannon, John M.; Hayes, Matthew; Östlin, Göran +7 more
Using new high-resolution data of CO (2-1), H$\alpha$ and H$\beta$ obtained with the Northern Extended Millimeter Array (NOEMA) and the Multi-Unit Spectroscopic Explorer (MUSE) at the Very Large Telescope, we have performed a Toomre Q disc stability analysis and studied star formation, gas depletion times and other environmental parameters on sub-…