Search Publications
The C/N ratio from FUV spectroscopy as a constraint on evolution of the dwarf nova HS 0218 + 3229
Szkody, Paula; El-Badry, Kareem; Gänsicke, Boris T. +8 more
White dwarfs that accrete from non-degenerate companions show anomalous carbon and nitrogen abundances in the photospheres of their stellar components have been postulated to be descendants of supersoft X-ray binaries. Measuring the carbon-to-nitrogen abundance ratio may provide constraints on their past evolution. We fit far-ultraviolet spectrosc…
TOI-908: a planet at the edge of the Neptune desert transiting a G-type star
Latham, David W.; Fernández Fernández, Jorge; Wheatley, Peter J. +41 more
We present the discovery of an exoplanet transiting TOI-908 (TIC-350153977) using data from TESS sectors 1, 12, 13, 27, 28, and 39. TOI-908 is a T = 10.7 mag G-dwarf (Teff = 5626 ± 61 K) solar-like star with a mass of 0.950 ± 0.010 M⊙ and a radius of 1.028 ± 0.030 R⊙. The planet, TOI-908 b, is a 3.18 ± 0.16 R⊕…
Investigating kinematics and dynamics of three open clusters towards Galactic anticentre
Bisht, D.; Rangwal, Geeta; Yadav, R. K. S. +2 more
We present the intracluster kinematics and dynamics of three open clusters: NGC 1193, NGC 2355, and King 12 by incorporating kinematical and photometric data from Gaia DR3, as well as a ground-based telescope. After selecting cluster members based on proper motion data, clusters' fundamental and structural parameters are investigated. We found the…
Constraints on the ultrafast outflows in the narrow-line Seyfert 1 galaxy Mrk 1044 from high-resolution time- and flux-resolved spectroscopy
Guainazzi, Matteo; Bianchi, Stefano; Jin, Chichuan +5 more
Ultrafast outflows (UFOs) have been revealed in a large number of active galactic nuclei (AGN) and are regarded as promising candidates for AGN feedback on the host galaxy. The nature and launching mechanism of UFOs are not yet fully understood. Here we perform a time- and flux-resolved X-ray spectroscopy on four XMM-Newton observations of a highl…
Discovery of TOI-1260d and the characterization of the multiplanet system
Guterman, P.; Alonso, R.; Deleuil, M. +84 more
We report the discovery of a third planet transiting the star TOI-1260, previously known to host two transiting sub-Neptune planets with orbital periods of 3.127 and 7.493 d, respectively. The nature of the third transiting planet with a 16.6-d orbit is supported by ground-based follow-up observations, including time-series photometry, high-angula…
Spectroscopic survey of faint planetary-nebula nuclei - II. The subdwarf O central star of Fr 2-30
Bond, Howard E.; Zeimann, Gregory R.; Werner, Klaus +1 more
Fr 2-30 = PN? G126.8-15.5 is a faint emission nebula, hosting a 14th-mag central star that we identify here for the first time. Deep Hα and [O III] images reveal a roughly elliptical nebula with dimensions of at least 22 arcmin × 14 arcmin, fading into a surrounding network of even fainter emission. Optical spectrograms of the central star show it…
Internal kinematics of dwarf satellites of MW/M31-like galaxies in TNG50
van der Marel, Roeland P.; del Pino, Andrés; Aparicio, Antonio +2 more
We present a kinematic study of a thousand of dwarf satellites of MW/M31-like hosts from the IllustrisTNG50 simulation. Internal kinematics were derived for all the snapshots to obtain a historical record of their rotation velocity in the plane of the sky (|VT|) and the amplitude of their velocity gradients along the line of sight ($A_{…
Asteroseismology of double-mode radial δ Scuti stars: AE Ursae Majoris and RV Arietis
Daszyńska-Daszkiewicz, J.; Walczak, P.; Szewczuk, W. +1 more
We construct complex seismic models of two high-amplitude δ Sct stars, AE UMa and RV Ari, each pulsating in two radial modes: fundamental and first overtone. Besides the frequencies of two radial modes, the models also reproduce the amplitude of bolometric flux variations (the non-adiabatic parameter f) for the dominant mode. Applying the Monte-Ca…
Unveiling polarized emission from interstellar dust of the Large Magellanic Cloud with Planck
Hughes, A.; Alina, D.; Lazarian, A. +5 more
Polarization of interstellar dust emission is a powerful probe of dust properties and magnetic field structure. Yet studies of external galaxies are hampered by foreground dust contribution. The study aims at separating the polarized signal from the Large Magellanic Cloud (LMC) from that of the Milky Way (MW) to construct a wide-field, spatially c…
Discovery of the shell structure via break radii in the outer halo of the Milky Way
Shi, Jianrong; Ma, Jun; Ye, Dashuang +1 more
Based on the Gaia DR3 RR Lyrae catalogue, we use two methods to fit the density profiles with an improved broken power law, and find that there are two break radii coinciding with the two apocentre pile-ups of high-eccentricity Gaia-Sausage-Enceladus (GSE) merger. Also, there is a break caused by the Sagittarius (Sgr) stream. Combining the positio…