1.5k citations · 2.2k across the 26 of their papers we have counts for
26 papers
Fine Structure of the Age-Chromospheric Activity Relation in Solar-Type Stars: II. H Line
Paulo V. Souza dos Santos, Gustavo F. Porto de Mello, Erica Costa-Bhering +4
Excess chromospheric emissions within deep photospheric lines are effective proxies of stellar magnetism for FGK stars. This emission decays with stellar age and is a potential det…
The Most Common Habitable Planets III -- Modeling Temperature Forcing and Surface Conditions on Rocky Exoplanets and Exomoons
Beatriz B. Siffert, Raquel G. Gonçalves Farias, Matias Garcia +4
Small rocky planets, as well as larger planets that suffered extensive volatile loss, tend to be drier and have thinner atmospheres as compared to Earth. Such planets probably outn…
M dwarf spectral indices at moderate resolution: accurate and [Fe/H] for 178 southern stars
E. Costa-Almeida, G. F. Porto de Mello, R. E. Giribaldi +2
We present a spectroscopic and photometric calibration to derive effective temperatures and metallicities [Fe/H] for M dwarfs, based on a Principal Component Ana…
The Most Common Habitable Planets II -- Salty Oceans in Low Mass Habitable Planets and Global Climate Evolution
R. Pinotti, G. F. Porto de Mello
Global climate evolution models for habitable earthlike planets do not consider the effect of ocean salinity on land ice formation through the hydrological cycle. We consider two c…
Faint solar analogs: at the limit of no reddening
Riano E. Giribaldi, Gustavo F. Porto de Mello, Diego Lorenzo-Oliveira +2
The flux distribution of solar analogs is required for calculating the spectral albedo of Solar System bodies such as asteroids and trans-Neptunian objects. Ideally a solar analog…
Chemo-kinematics of the Milky Way from the SDSS-III MARVELS Survey
Nolan Grieves, Jian Ge, Neil Thomas +20
Combining stellar atmospheric parameters, such as effective temperature, surface gravity, and metallicity, with barycentric radial velocity data provides insight into the chemo-dyn…
Zero Age Planetary Orbit of Gas Giant Planets Revisited: Reinforcement of the Link with Stellar Metallicity
Rafael Pinotti, Heloisa Maria Boechat-Roberty, Gustavo Frederico Porto de Mello
In 2005 we suggested a relation between the optimal locus of gas giant planet formation, prior to migration, and the metallicity of the host star, based on the core accretion model…
The age-mass-metallicity-activity relation for solar-type stars: Comparisons with asteroseismology and the NGC 188 open cluster
Diego Lorenzo-Oliveira, Gustavo F. Porto de Mello, Ricardo P. Schiavon
The Mount Wilson Ca II index log is the accepted standard metric of calibration for the chromospheric activity versus age relation of FGK stars. Recent results claim…
Fine structure of the age-chromospheric activity relation in solar-type stars I: The Ca II infrared triplet: Absolute flux calibration
Diego Lorenzo-Oliveira, Gustavo F. Porto de Mello, Letícia Dutra-Ferreira +1
Strong spectral lines are useful indicators of stellar chromospheric activity. They are physically linked to the convection efficiency, differential rotation, and angular momentum…
Consistent metallicity scale for cool dwarfs and giants. A benchmark test using the Hyades
Letícia Dutra-Ferreira, Luca Pasquini, Rodolfo Smiljanic +2
In several instances chemical abundances of dwarf and giant stars are used simultaneously under the assumption that they share the same abundance scale. This assumption might have…
A photometric and spectroscopic survey of solar twin stars within 50 parsecs of the Sun: I. Atmospheric parameters and color similarity to the Sun
G. F. Porto de Mello, R. da Silva, L. da Silva +1
Solar twins and analogs are fundamental in the characterization of the Sun's place in the context of stellar measurements, as they are in understanding how typical the solar proper…
High-resolution spectropolarimetric of k Cet: A proxy for the young Sun
J. D. do Nascimento, P. Petit, S. Marsden +6
Among the solar proxies studied in the Sun in Time k Cet (HD 20630) stands out as potentially having a mass very close to solar and a young age. On this study, we monitored the mag…
The future of the Sun: an evolved solar twin revealed by CoRoT
J. -D. do Nascimento, Y. Takeda, J. Melendez +3
The question of whether the Sun is peculiar within the class of solar-type stars has been the subject of active investigation over the past three decades. Although several solar tw…
Overview of semi-sinusoidal stellar variability with the CoRoT satellite
J. R. De Medeiros, C. E. Ferreira Lopes, I. C. Leao +13
To date, the CoRoT space mission has produced more than 124,471 light curves. Classifying these curves in terms of unambiguous variability behavior is mandatory for obtaining an un…
MARVELS-1: A face-on double-lined binary star masquerading as a resonant planetary system; and consideration of rare false positives in radial velocity planet searches
Jason T. Wright, Arpita Roy, Suvrath Mahadevan +24
We have analyzed new and previously published radial velocity observations of MARVELS-1, known to have an ostensibly substellar companion in a ~6- day orbit. We find significant (~…
Very Low Mass Stellar and Substellar Companions to Solar-Like Stars From MARVELS V: A Low Eccentricity Brown Dwarf from the Driest Part of the Desert, MARVELS-6b
Nathan De Lee, Jian Ge, Justin R. Crepp +43
We describe the discovery of a likely brown dwarf (BD) companion with a minimum mass of 31.7 +/- 2.0 M_Jup to GSC 03546-01452 from the MARVELS radial velocity survey, which we desi…
Very Low-mass Stellar and Substellar Companions to Solar-like Stars from Marvels III: A Short-Period Brown Dwarf Candidate Around An Active G0Iv Subgiant
Bo Ma, Jian Ge, Rory Barnes +45
We present an eccentric, short-period brown dwarf candidate orbiting the active, slightly evolved subgiant star TYC 2087-00255-1, which has effective temperature T_eff = 5903+/-42…
The Ninth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Baryon Oscillation Spectroscopic Survey
III Collaboration, Christopher P. Ahn, Rachael Alexandroff +224
The Sloan Digital Sky Survey III (SDSS-III) presents the first spectroscopic data from the Baryon Oscillation Spectroscopic Survey (BOSS). This ninth data release (DR9) of the SDSS…
Accurate and homogeneous abundance patterns in solar-type stars of the solar neighbourhood: a chemo-chronological analysis
R. da Silva, G. F. Porto de Mello, A. C. Milone +3
We report the abundances of C, Na, Mg, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Y, Zr, Ba, Ce, Nd, and Sm in 25 solar-type stars in the solar neighbourhood, and their cor…
Very Low-Mass Stellar and Substellar Companions to Solar-Like Stars from MARVELS I: A Low Mass Ratio Stellar Companion to TYC 4110-01037-1 in a 79-day Orbit
John P. Wisniewski, Jian Ge, Justin R. Crepp +42
TYC 4110-01037-1 has a low-mass stellar companion, whose small mass ratio and short orbital period are atypical amongst solar-like (Teff ~< 6000 K) binary systems. Our analysis of…
Eclipsing Binary Science Via the Merging of Transit and Doppler Exoplanet Survey Data - A Case Study With the MARVELS Pilot Project and SuperWASP
Scott W. Fleming, Pierre F. L. Maxted, Leslie Hebb +28
Exoplanet transit and Doppler surveys discover many binary stars during their operation that can be used to conduct a variety of ancillary science. Specifically, eclipsing binary s…
MARVELS-1b: A Short-Period, Brown Dwarf Desert Candidate from the SDSS-III MARVELS Planet Search
Brian L. Lee, Jian Ge, Scott W. Fleming +59
We present a new short-period brown dwarf candidate around the star TYC 1240-00945-1. This candidate was discovered in the first year of the Multi-object APO Radial Velocity Exopla…
Mn, Cu and Zn abundances in barium stars and their correlations with neutron capture elements
Dinah M. Allen, Gustavo F. Porto de Mello
We present abundances of Mn, Cu, Zn and various light and heavy elements for a sample of barium and normal giant stars, and present correlations between abundances contributed to d…
Evolution of the solar activity over time and effects on planetary atmospheres. II. kappa^1 Ceti, an analog of the Sun when life arose on Earth
I. Ribas, G. F. Porto de Mello, L. D. Ferreira +6
The early evolution of Earth's atmosphere and the origin of life took place at a time when physical conditions at the Earth where radically different from its present state. The ra…