Search Publications
Period spacings of γ Doradus pulsators in the Kepler field: Rossby and gravity modes in 82 stars
Li, Gang; Bedding, Timothy R.; Antoci, Victoria +2 more
Rossby modes are the oscillations in a rotating fluid, whose restoring force is the Coriolis force. They provide an additional diagnostic to understand the rotation of stars, which complicates asteroseismic modelling. We report 82 γ Doradus stars for which clear period spacing patterns of both gravity and Rossby modes have been detected. The perio…
A possibly inflated planet around the bright young star DS Tucanae A
Sabotta, S.; Messina, S.; D'Orazi, V. +13 more
Context. The origin of the observed diversity of planetary system architectures is one of the main topics of exoplanetary research. The detection of a statistically significant sample of planets around young stars allows us to study the early stages of planet formation and evolution, but only a handful are known so far. In this regard a considerab…
The non-uniformity of galaxy cluster metallicity profiles
Lovisari, L.; Reiprich, T. H.
We study a sample of 207 nearby galaxy groups and clusters observed with XMM-Newton. Key aspects of this sample include the large size, the high data quality, and the large diversity of cluster dynamical states. We determine the overall metallicity within 0.3 R500 and the radial distribution of the metals. On average, we find a mild dep…
Ambient Column Densities of Highly Ionized Oxygen in Precipitation-limited Circumgalactic Media
Voit, G. Mark
Many of the baryons associated with a galaxy reside in its circumgalactic medium (CGM), in a diffuse volume-filling phase at roughly the virial temperature. Much of the oxygen produced over cosmic time by the galaxy’s stars also ends up there. The resulting absorption lines in the spectra of UV and X-ray background sources are powerful diagnostics…
Organic chemistry in the innermost, infalling envelope of the Class 0 protostar L483
Choi, Minho; Di Francesco, James; Lee, Jeong-Eun +3 more
Context. Observations of the innermost regions of deeply embedded protostellar cores have revealed complicated physical structures as well as a rich chemistry with the existence of complex organic molecules. The protostellar envelopes, outflow, and large-scale chemistry of Class 0 and Class I objects have been well studied, but while previous work…
Evidence for an Aspherical Population III Supernova Explosion Inferred from the Hyper-metal-poor Star HE 1327-2326
Placco, Vinicius M.; Tominaga, Nozomu; Nomoto, Ken'ichi +6 more
We present observational evidence that an aspherical supernova explosion could have occurred in the first stars in the early universe. Our results are based on the first determination of a Zn abundance in a Hubble Space Telescope/Cosmic Origins Spectrograph high-resolution UV spectrum of a hyper-metal-poor (HMP) star, HE 1327-2326, with {{[Fe/H]}}…
Water vapor detection in the transmission spectra of HD 209458 b with the CARMENES NIR channel
Schmitt, J. H. M. M.; Alonso-Floriano, F. J.; Sánchez-López, A. +31 more
Aims: We aim at detecting water vapor in the atmosphere of the hot Jupiter HD 209458 b and perform a multi-band study in the near infrared with CARMENES.
Methods: The water vapor absorption lines from the atmosphere of the planet are Doppler-shifted due to the large change in its radial velocity during transit. This shift is of the order…
Ring structure in the MWC 480 disk revealed by ALMA
Pascucci, Ilaria; Banzatti, Andrea; Herczeg, Gregory J. +20 more
Gap-like structures in protoplanetary disks are likely related to planet formation processes. In this paper, we present and analyze high-resolution (0.17''× 0.11'') 1.3 mm ALMA continuum observations of the protoplanetary disk around the Herbig Ae star MWC 480. Our observations show for the first time a gap centered at 74 au with a width of 23 au,…
SI IV Resonance Line Emission during Solar Flares: Non-LTE, Nonequilibrium, Radiation Transfer Simulations
Kerr, Graham S.; Carlsson, Mats; Young, Peter R. +2 more
The Interface Region Imaging Spectrograph routinely observes the Si IV resonance lines. When analyzing quiescent observations of these lines, it has typically been assumed that they form under optically thin conditions. This is likely valid for the quiescent Sun, but this assumption has also been applied to the more extreme flaring scenario. We us…
PynPoint: a modular pipeline architecture for processing and analysis of high-contrast imaging data
Quanz, S. P.; Amara, A.; Stolker, T. +4 more
Context. The direct detection and characterization of planetary and substellar companions at small angular separations is a rapidly advancing field. Dedicated high-contrast imaging instruments deliver unprecedented sensitivity, enabling detailed insights into the atmospheres of young low-mass companions. In addition, improvements in data reduction…