We study graviton-graviton scattering in partial-wave amplitudes after unitarizing their Born terms. In order to apply S-matrix techniques, based on unitarity and analyticity, we introduce an S-matrix associated to this resummation that is free of infrared divergences. This is achieved by removing the diverging phase factor calculated by Weinberg

This article reports quasi-continuous transiting events towards WD 1054-226 at d = 36.2 pc and V = 16.0 mag, based on simultaneous, high-cadence, multiwavelength imaging photometry using ULTRACAM over 18 nights from 2019 to 2020 March. The predominant period is 25.02 h and corresponds to a circular orbit with blackbody T eq = 323 K, where a

Context. The substellar triple system VHS J125601.92−125723.9 (hereafter VHS 1256−1257) is composed of an equal-mass M7.5 brown dwarf binary and an L7 low-mass substellar object. In Guirado et al. (2018, A&A, 610, A23) we published the detection of radio emission at 8.4 GHz coming from the central binary and making it an excellent target for

A pesar de que actualmente se conocen alrededor de 5000 planetas, solo unos pocos (~1%) de ellos se han descubierto orbitando alrededor de estrellas con una edad conocida menor de ~1 Ga. Por lo tanto, carecemos de la información necesaria para imponer restricciones sobre los mecanismos que regulan la formación y evolución de sistemas planetarios y

Stellar radial migration plays an important role in reshaping a galaxy's structure and the radial distribution of stellar population properties. In this work, we revisit reported observational evidence for radial migration and quantify its strength using the age-[Fe/H] distribution of stars across the Milky Way with APOGEE data. We find a broken

Classical novae are cataclysmic binary star systems in which the matter of a companion star is accreted on a white dwarf 1,2. Accumulation of hydrogen in a layer eventually causes a thermonuclear explosion on the surface of the white dwarf 3, brightening the white dwarf to ~10 5 solar luminosities and triggering ejection of the accumulated matter