Search Publications
Quasi-Periodic Pulsations in Solar and Stellar Flares. Review
Kolotkov, Dmitrii; Kupriyanova, Elena; Nakariakov, Valery +1 more
This paper provides an overview of the state-of-the-art studies of oscillatory processes in solar and stellar flares, based on modern observational data from ground-based and space-borne instruments with high temporal, spatial, and spectral resolution in different bands of the electromagnetic spectrum. We examine the mecha-nisms that generate flar…
Precise radio astrometry and new developments for the next-generation of instruments
Rioja, María J.; Dodson, Richard
We present a technique-led review of the progression of precise radio astrometry, from the first demonstrations, half a century ago, until to date and into the future. We cover the developments that have been fundamental to allow high accuracy and precision astrometry to be regularly achieved. We review the opportunities provided by the next gener…
Probing the size and charge of polycyclic aromatic hydrocarbons
Peeters, E.; Maragkoudakis, A.; Ricca, A.
We present a new method to accurately describe the ionization fraction and the size distribution of polycyclic aromatic hydrocarbons (PAHs) within astrophysical sources. To this purpose, we have computed the mid-infrared emission spectra of 308 PAH molecules of varying sizes, symmetries, and compactness, generated in a range of radiation fields. W…
An ultrahot Neptune in the Neptune desert
Jackman, James A. G.; Bieryla, Allyson; Latham, David W. +81 more
About 1 out of 200 Sun-like stars has a planet with an orbital period shorter than one day: an ultrashort-period planet1,2. All of the previously known ultrashort-period planets are either hot Jupiters, with sizes above 10 Earth radii (R⊕), or apparently rocky planets smaller than 2 R⊕. Such lack of planets of inte…
Optical phase curve of the ultra-hot Jupiter WASP-121b
Heng, K.; Ehrenreich, D.; Lendl, M. +28 more
We present the analysis of TESS optical photometry of WASP-121b, which reveals the phase curve of this transiting ultra-hot Jupiter. Its hotspot is located at the sub-stellar point, showing inefficient heat transport from the dayside (2870 ± 50 K) to the nightside (<2500 K at 3σ) at the altitudes probed by TESS. The TESS eclipse depth, measured…
Solar System Objects Observed with TESS—First Data Release: Bright Main-belt and Trojan Asteroids from the Southern Survey
Pál, András; Kalup, Csilla; Szakáts, Róbert +10 more
Compared with previous space-borne surveys, the Transiting Exoplanet Survey Satellite (TESS) provides a unique and new approach to observe solar system objects. While its primary mission avoids the vicinity of the ecliptic plane by approximately six degrees, the scale height of the solar system debris disk is large enough to place various small bo…
The RGB tip of galactic globular clusters and the revision of the axion-electron coupling bound
Dalessandro, E.; Ferraro, F. R.; Pallanca, C. +5 more
Context. The production of neutrinos by plasma oscillations is the most important energy sink process operating in the degenerate core of low-mass red giant stars. This process counterbalances the release of energy induced by nuclear reactions and gravitational contraction, and determines the luminosity attained by a star at the moment of the He i…
The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: The Nature of the Faintest Dusty Star-forming Galaxies
Inami, Hanae; Smail, Ian; Bouwens, Rychard J. +20 more
We present a characterization of the physical properties of a sample of 35 securely detected, dusty galaxies in the deep ALMA 1.2 mm image obtained as part of the ALMA Spectroscopic Survey in the Hubble Ultra Deep Field (ASPECS) Large Program. This sample is complemented by 26 additional sources identified via an optical/infrared source positional…
Stellar population models based on the SDSS-IV MaStar library of stellar spectra - I. Intermediate-age/old models
Stassun, K.; Bizyaev, D.; Chen, Y. +14 more
We use the first release of the SDSS/MaStar stellar library comprising ∼9000, high S/N spectra, to calculate integrated spectra of stellar population models. The models extend over the wavelength range 0.36-1.03 µm and share the same spectral resolution ( $R\sim 1800$ ) and flux calibration as the SDSS-IV/MaNGA galaxy data. The parameter space cov…
Efficient solution of the anisotropic spherically aligned axisymmetric Jeans equations of stellar hydrodynamics for galactic dynamics
Cappellari, Michele
I present a flexible solution for the axisymmetric Jeans equations of stellar hydrodynamics under the assumption of an anisotropic (three-integral) velocity ellipsoid aligned with the spherical polar coordinate system. I describe and test a robust and efficient algorithm for its numerical computation. I outline the evaluation of the intrinsic velo…