Search Publications
Common envelope evolution in born-again planetary nebulae - Shaping the H-deficient ejecta of A 30
Chu, Y. -H.; Guerrero, M. A.; Toalá, J. A. +7 more
Born-again planetary nebulae (PNe) are extremely rare cases in the evolution of solar-like stars. It is commonly accepted that their central stars (CSPN) experienced a very late thermal pulse (VLTP), ejecting H-deficient material inside the evolved H-rich PN. Given the short duration of this event and the fast subsequent evolution of the CSPN, det…
FGC 1287 and its enigmatic 250 kpc long HI tail in the outskirts of Abell 1367
Finoguenov, A.; Cortese, L.; Scott, T. C. +3 more
We present H I and radio continuum, narrow-band Hα imaging, IFU spectroscopy, and X-ray observations of the FGC 1287 triplet projected ~1.8 Mpc west of the galaxy cluster Abell 1367. One triplet member, FGC 1287, displays an exceptionally long, 250 kpc H I tail and an unperturbed stellar disc which are the typical signatures of ram pressure stripp…
Milky Way-like galaxies: stellar population properties of dynamically defined discs, bulges and stellar haloes
Tissera, Patricia B.; Obreja, Aura; Ortega-Martinez, Sara +3 more
The formation of galaxies can be understood in terms of the assembly patterns of each type of galactic component. To perform this kind of analysis, it is necessary to define some criteria to separate those components. Decomposition methods based on dynamical properties are more physically motivated than photometry-based ones. We use the unsupervis…
SWIFT J0503.7-2819: a nearly synchronous intermediate polar below the period gap?
Pandey, J. C.; Scaringi, Simone; Joshi, Arti +2 more
Based on the X-ray observations from XMM-Newton and Swift, and optical observations from Transiting Exoplanet Survey Satellite (TESS) and AAVSO, we present temporal and spectral properties of probable intermediate polar SWIFT J0503.7-2819. The X-ray light curve shows two distinctive features, where possibly the second pole seems to be active durin…
Searching for nascent planetary nebulae: OHPNe candidates in the SPLASH survey
Miranda, Luis F.; de Gregorio-Monsalvo, Itziar; Imai, Hiroshi +7 more
The evolution of asymptotic giant branch stars from the spherical symmetry into the diverse shapes of planetary nebulae (PNe) is a topic of intensive research. Young PNe provide a unique opportunity to characterize the onset of this transitional phase. In particular, OH maser-emitting PNe (OHPNe) are considered nascent PNe. In fact, only six OHPNe…
QU Vul: An integral field spectroscopy case study of a nova shell
Guerrero, M. A.; Toalá, J. A.; Santamaría, E. +2 more
We present GTC MEGARA high-dispersion integral field spectroscopic observations of the nova remnant QU Vul, which provide a comprehensive 3D view of this nova shell. The tomographic analysis of the H α emission reveals a complex physical structure characterized by an inhomogeneous and clumpy distribution of the material within this shell. The over…
Core orientations and magnetic fields in isolated molecular clouds
Soam, Archana; Lee, Chang Won; Sharma, Ekta +2 more
Molecular clouds are sites of star formation. Magnetic fields are believed to play an important role in their dynamics and shaping morphology. We aim to study any possible correlation that might exist between the magnetic fields orientation inside the clouds and the magnetic fields at envelope scales and their connection with respect to the observ…
Dynamical orbital evolution scenarios of the wide-orbit eccentric planet HR 5183b
Blunt, Sarah; Mustill, Alexander J.; Davies, Melvyn B. +1 more
The recently discovered giant exoplanet HR5183b exists on a wide, highly eccentric orbit (a = 18 au, e = 0.84). Its host star possesses a common proper-motion companion which is likely on a bound orbit. In this paper, we explore scenarios for the excitation of the eccentricity of the planet in binary systems such as this, considering planet-planet…
On measuring the Hubble constant with X-ray reverberation mapping of active galactic nuclei
Ingram, Adam; García, Javier A.; Kara, Erin +8 more
We show that X-ray reverberation mapping can be used to measure the distance to type 1 active galactic nuclei (AGNs). This is because X-ray photons originally emitted from the 'corona' close to the black hole irradiate the accretion disc and are reemitted with a characteristic 'reflection' spectrum that includes a prominent ~6.4 keV iron emission …
Nebular abundance gradient in the Cartwheel galaxy using MUSE data
Ramos-Larios, Gerardo; Mayya, Divakara; Zaragoza-Cardiel, Javier +1 more
We here present the results from a detailed analysis of nebular abundances of commonly observed ions in the collisional ring galaxy Cartwheel using the Very Large Telescope (VLT) Multi-Unit Spectroscopic Explorer (MUSE) data set. The analysis includes 221 H II regions in the star-forming ring, in addition to 40 relatively fainter H α-emitting regi…