Search Publications
Slowly rotating close binary stars in Cassini states
Fuller, Jim; Felce, Catherine
Recent asteroseismic measurements have revealed a small population of stars in close binaries, containing primaries with extremely slow rotation rates. Such stars defy the standard expectation of tidal synchronization in such systems, but they can potentially be explained if they are trapped in a spin-orbit equilibrium known as Cassini state 2 (CS…
MUSE-ALMA Haloes - IX. Morphologies and stellar properties of gas-rich galaxies
Hayes, Matthew; Kacprzak, Glenn G.; Kulkarni, Varsha P. +15 more
Understanding how galaxies interact with the circumgalactic medium (CGM) requires determining how galaxies' morphological and stellar properties correlate with their CGM properties. We report an analysis of 66 well-imaged galaxies detected in Hubble Space Telescope and Very Large Telescope MUSE observations and determined to be within ±500 km s
Converting the sub-Jovian desert of exoplanets to a savanna with TESS, PLATO, and Ariel
Pál, András; Bódi, Attila; Szabó, Róbert +3 more
There is a lack of exoplanets with sizes similar to Neptune orbiting their host stars with periods ≲3 d - hence the name 'sub-Jovian/Neptune desert'. Recently, several exoplanets have been confirmed to reside in the desert, transforming it into a 'savanna' with several 'giraffe' planets (such as LTT 9779 b and TOI-674 b). The most prominent scenar…
Dynamics of the star-forming region G345.51+0.84
Liu, Hong-Li; Qin, Sheng-Li; Pan, Sirong
With the Atacama Pathfinder Experiment mapping observations of 13CO and C18O (2-1) complemented with Herschel data, we have carried out a comprehensive analysis on dynamics of the G345.51+0.84 (G345 hereafter) region. It is composed of two physically connected components: the blue-shifted (i.e. G345Blue), and red-shifted velo…
Joint HST, VLT/MUSE, and XMM-Newton observations to constrain the mass distribution of the two strong lensing galaxy clusters: MACS J0242.5-2132 and MACS J0949.8+1708
Lewis, Geraint F.; Mahler, Guillaume; Lagattuta, David J. +6 more
We present the strong lensing analysis of two galaxy clusters: MACS J0242.5-2132 (MACS J0242, z = 0.313) and MACS J0949.8+1708 (MACS J0949, z = 0.383). Their total matter distributions are constrained, thanks to the powerful combination of observations with the Hubble Space Telescope (HST) and the Multi-Unit Spectroscopic Explorer instrument. Usin…
Polycyclic aromatic hydrocarbon size tracers
Boersma, C.; Peeters, E.; Maragkoudakis, A. +1 more
We examine the dependence of polycyclic aromatic hydrocarbon (PAH) band intensity ratios as a function of the average number of carbon atoms and assess their effectiveness as tracers for PAH size, utilizing the data, models, and tools provided by the NASA Ames PAH Infrared Spectroscopic Data base. To achieve this, we used spectra from mixtures of …
A Bayesian chemical evolution model of the DustPedia galaxy M74
Meneghetti, Massimo; Pozzi, Francesca; Calura, Francesco +8 more
We introduce a new, multizone chemical evolution model of the DustPedia galaxy M74, calibrated by means of Markov Chain Monte Carlo methods. We take into account the observed stellar and gas density profiles and use Bayesian analysis to constrain two fundamental parameters characterizing the gas accretion and star formation time-scale, i.e. the in…
A sub-Neptune transiting the young field star HD 18599 at 40 pc
Tamura, M.; Liu, H.; Zhang, H. +66 more
Transiting exoplanets orbiting young nearby stars are ideal laboratories for testing theories of planet formation and evolution. However, to date only a handful of stars with age <1 Gyr have been found to host transiting exoplanets. Here we present the discovery and validation of a sub-Neptune around HD 18599 , a young (300 Myr), nearby (d = 40…
HD 42477: coupled r modes, g modes, and a p mode in an A0Vnne star
Handler, G.; Lee, U.; Saio, H. +4 more
Several studies have shown that a number of stars pulsating in p modes lie between the β Cep and δ Sct instability strips in the Hertzsprung-Russell (HR) Diagram. At present, there is no certain understanding of how p modes can be excited in this Teff range. The goal of this work is to disprove the conjecture that all stars pulsating in…
Rotation and activity in late-type members of the young cluster ASCC 123
Bragaglia, A.; Frasca, A.; Alonso-Santiago, J. +1 more
ASCC 123 is a little-studied young and dispersed open cluster. Recently, we conducted the first research devoted to it. In this paper, we complement our previous work with Transiting Exoplanet Survey Satellite (TESS) photometry for the 55 likely members of the cluster. We pay special attention to seven of these high-probability members, all with F…