7.1k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Universidade do PortoPT1.3k papers
- Centre National de la Recherche ScientifiqueFR1k papers
- University of LisbonPT992 papers
- University of GenevaCH631 papers
- Centro de Astrofísica da Universidade do PortoPT606 papers
- Instituto de Astrofísica de CanariasES604 papers
- Universidad de La LagunaES521 papers
- Leiden UniversityNL495 papers
- Sorbonne UniversitéFR492 papers
- Aix-Marseille UniversitéFR480 papers
- Université Paris CitéFR466 papers
- Institut d'Astrophysique de ParisFR446 papers
58 papers · 1 filter
The Mass of Kepler-93b and The Composition of Terrestrial Planets
Courtney D. Dressing, David Charbonneau, Xavier Dumusque +32
Kepler-93b is a 1.478 +/- 0.019 Earth radius planet with a 4.7 day period around a bright (V=10.2), astroseismically-characterized host star with a mass of 0.911+/-0.033 solar mass…
Tracking the Stellar Longitudes of Starspots in Short-Period Kepler Binaries
Bhaskaran Balaji, Bryce Croll, Alan M. Levine +1
We report on a new method for tracking the phases of the orbital modulations in very short-period, near-contact, and contact binary systems systems in order to follow starspots. We…
Beyond Einstein's General Relativity
Francisco S. N. Lobo
Modern astrophysical and cosmological models are plagued with two severe theoretical difficulties, namely, the dark energy and the dark matter problems. Relative to the former, hig…
Extended Theories of Gravity with Generalized Energy Conditions
José P. Mimoso, Francisco S. N. Lobo, Salvatore Capozziello
We address the problem of the energy conditions in modified gravity taking into account the additional degrees of freedom related to scalar fields and curvature invariants. The lat…
The HARPS search for southern extra-solar planets XXXVI: Five new long-period giant planets and a system update
C. Moutou, G. Lo Curto, M. Mayor +10
We describe radial-velocity time series obtained by HARPS on the 3.60 m telescope in La Silla (ESO, Chile) over ten years and report the discovery of five new giant exoplanets in d…
Identifying the first generation of radio powerful AGN in the Universe with the SKA
Jose Afonso, Jordi Casanellas, Isabella Prandoni +4
One of the most challenging and exciting subjects in modern astrophysics is that of galaxy formation at the epoch of reionisation. The SKA, with its revolutionary capabilities in t…
Characterizing K2 Planet Discoveries: A super-Earth transiting the bright K-dwarf HIP 116454
Andrew Vanderburg, Benjamin T. Montet, John Asher Johnson +43
We report the first planet discovery from the two-wheeled Kepler (K2) mission: HIP 116454 b. The host star HIP 116454 is a bright (V = 10.1, K = 8.0) K1-dwarf with high proper moti…
Li abundances in F stars: planets, rotation and galactic evolution
E. Delgado Mena, S. Bertrán de Lis, V. Zh. Adibekyan +7
We find that hot jupiter host stars within the T range 5900-6300K show lower Li abundances, by 0.14 dex, than stars without detected planets. This offset has a signi…
Crystal clear lessons on the microstructure of space-time and modified gravity
Francisco S. N. Lobo, Gonzalo J. Olmo, D. Rubiera-Garcia
We argue that a microscopic structure for space-time such as that expected in a quantum foam scenario, in which microscopic wormholes and other topological structures should play a…
BGLS: A Bayesian formalism for the generalised Lomb-Scargle periodogram
A. Mortier, J. P. Faria, C. M. Correia +2
Context. Frequency analyses are very important in astronomy today, not least in the ever-growing field of exoplanets, where short-period signals in stellar radial velocity data are…
The Herschel Virgo Cluster Survey. XVIII. Star-forming dwarf galaxies in a cluster environment
M. Grossi, L. K. Hunt, S. C. Madden +22
To assess the effects of the cluster environment on the different components of the interstellar medium, we analyse the FIR-submm properties of a sample of star-forming dwarf (SFD)…
Semiclassical energy conditions and wormholes
Prado Martin-Moruno
We consider the nonlinear energy conditions and their quantum extensions. These new energy conditions behave much better than the usual pointwise energy conditions in the presence…
An off-centered active galactic nucleus in NGC 3115
R. B. Menezes, J. E. Steiner, T. V. Ricci
NGC 3115 is an S0 galaxy that has always been considered to have a pure absorption-line spectrum. Some recent studies have detected a compact radio-emitting nucleus in this object,…
Revisiting the correlation between stellar activity and planetary surface gravity
P. Figueira, M. Oshagh, V. Zh. Adibekyan +1
Aims: We re-evaluate the correlation between planetary surface gravity and stellar host activity as measured by the index log(). This correlation, previously identified by…
Non-minimal scalar-tensor theories
Ismael Ayuso, Jose A. R. Cembranos
We compute the spectrum of scalar models with a general coupling to the scalar curvature. We find that the perturbative states of these theories are given by two massive spin-0 mod…
SOPHIE velocimetry of Kepler transit candidates XIV. A joint photometric, spectroscopic, and dynamical analysis of the Kepler-117 system
G. Bruno, J. -M. Almenara, S. C. C. Barros +9
As part of our follow-up campaign of Kepler planets, we observed Kepler-117 with the SOPHIE spectrograph at the Observatoire de Haute-Provence. This F8-type star hosts two transiti…
Thick brane in gravity with Palatini dynamics
D. Bazeia, L. Losano, R. Menezes +2
This work deals with modified gravity in five dimensional spacetime. We study a thick Palatini brane, that is, a braneworld scenario described by an anti-de Sitter warped ge…
Could the dynamics of the Universe be influenced by what is going on inside black holes?
P. P. Avelino
We investigate the potential impact of mass inflation inside black holes on the dynamics of the Universe, considering a recent reformulation of general relativity, proposed in [1],…
Variability of Disk Emission in Pre-Main Sequence and Related Stars. III. Exploring Structural Changes in the Pre-transitional Disk in HD 169142
Kevin R. Wagner, Michael L. Sitko, Carol A. Grady +17
We present near-IR and far-UV observations of the pre-transitional (gapped) disk in HD 169142 using NASA's Infrared Telescope Facility and Hubble Space Telescope. The combination o…
On the Expansion Rate, Age, and Distance of the Supernova Remnant G266.2-1.2 (Vela Jr.)
G. E. Allen, K. Chow, T. DeLaney +4
An analysis of Chandra ACIS data for two relatively bright and narrow portions of the northwestern rim of G266.2-1.2 (a.k.a. RX J0852.0-4622 or Vela Jr.) reveal evidence of a radia…
Anti-aliasing Wiener filtering for wave-front reconstruction in the spatial-frequency domain for high-order astronomical adaptive-optics systems
Carlos M. Correia, Joel Teixeira
Computationally-efficient wave-front reconstruction techniques for astronomical adaptive optics systems have seen a great development in the past decade. Algorithms developed in th…
SOPHIE velocimetry of Kepler transit candidates. XIII. KOI-189 B and KOI-686 B: two very low-mass stars in long-period orbits
R. F. Díaz, G. Montagnier, J. Leconte +10
We present the radial-velocity follow-up of two Kepler planetary transiting candidates (KOI-189 and KOI-686) carried out with the SOPHIE spectrograph at the Observatoire de Haute P…
Characterization of the four new transiting planets KOI-188b, KOI-195b, KOI-192b, and KOI-830b
G. Hebrard, A. Santerne, G. Montagnier +10
The characterization of four new transiting extrasolar planets is presented here. KOI-188b and KOI-195b are bloated hot Saturns, with orbital periods of 3.8 and 3.2 days, and masse…
Vacuum energy sequestering and cosmic dynamics
P. P. Avelino
We explicitly compute the dynamics of closed homogeneous and isotropic universes permeated by a single perfect fluid with a constant equation of state parameter in the context…