R. Naves Nogues
A5029875203- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Radio Astronomy Observations and Technology
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Pulsars and Gravitational Waves Research
- Stellar, planetary, and galactic studies
- Particle physics theoretical and experimental studies
- Superconducting Materials and Applications
- Precipitation Measurement and Analysis
- Solar and Space Plasma Dynamics
Public Citizen
2023
American Association of Variable Star Observers
2022
ABSTRACT OJ 287 is a quasi-periodic quasar with roughly 12 year optical cycles. It displays prominent outbursts that are predictable in binary black hole model. The model predicted major outburst 2015 December. We found the did occur within expected time range, peaking on December 5 at magnitude 12.9 R -band. Based Swift /XRT satellite measurements and polarization data, we find it included thermal component. Its timing provides an accurate estimate for spin of primary hole, . present also...
Abstract Results from regular monitoring of relativistic compact binaries like PSR 1913+16 are consistent with the dominant (quadrupole) order emission gravitational waves (GWs). We show that observations associated binary black hole (BBH) central engine blazar OJ 287 demand inclusion radiation reaction effects beyond quadrupolar order. It turns out even certain hereditary contributions to GW required predict impact flare timings 287. develop an approach incorporates this effect into BBH...
Abstract We present the results of our power spectral density analysis for BL Lac object OJ 287, utilizing Fermi -LAT survey at high-energy γ -rays, Swift -XRT in X-rays, several ground-based telescopes and Kepler satellite optical, radio GHz frequencies. The light curves are modeled terms continuous-time autoregressive moving average (CARMA) processes. Owing to inclusion data, we were able construct first time optical variability spectrum a blazar without any gaps across ∼6 dex temporal Our...
ABSTRACT We present the discovery and characterization of six short-period, transiting giant planets from NASA’s Transiting Exoplanet Survey Satellite (TESS) -- TOI-1811 (TIC 376524552), TOI-2025 394050135), TOI-2145 88992642), TOI-2152 395393265), TOI-2154 428787891), TOI-2497 97568467). All orbit bright host stars (8.9 <G < 11.8, 7.7 <K 10.1). Using a combination time-series photometric spectroscopic follow-up observations TESS Follow-up Observing Program Working...
We carried out a pilot campaign of radio and optical band intra-day variability (IDV) observations five blazars (3C66A, S5 0716+714, OJ287, B0925+504, BL Lacertae) on December 18--21, 2015 by using the telescope in Effelsberg (Germany) several telescopes Asia, Europe, America. After calibration, light curves from both 5 GHz R were obtained, although data not smoothly sampled over sampling period about four days. tentatively analyse amplitudes time scales variabilities, any possible...
We analyse the light curve in R band of blazar OJ287, gathered during 2015/2016 observing season. did a search for quasi-periodic oscillations (QPOs) using several methods over wide range timescales. No statistically significant periods were found high-frequency domain both ground-based data and Kepler observations. In longer-period domain, Lomb–Scargle periodogram revealed peaks above 99% significance level. The longest one—about 95 days—corresponds to innermost stable circular orbit (ISCO)...
ABSTRACT V392 Persei is a known dwarf nova (DN) that underwent classical eruption in 2018. Here we report ground-based optical, Swift UV and X-ray, Fermi-LAT γ-ray observations following the for almost three years. Per one of fastest evolving novae yet observed, with t2 decline time 2 d. Early spectra present evidence multiple interacting mass ejections, associated shocks driving both early optical luminosity. entered Sun-constraint within days eruption. Upon exit, had evolved to nebular...
ABSTRACT OJ 287 is a BL Lacertae type quasar in which the active galactic nucleus (AGN) outshines host galaxy by an order of magnitude. The only exception to this may be at minimum light when AGN activity so low that make quite considerable contribution photometric intensity source. Such dip or fade occurred 2017 November, its brightness was about 1.75 mag lower than recent mean level. We compare observations with similar fades observed earlier 1989, 1999, and 2010. It appears there...
We analyse the light curve in R-band gathered during 2015/16 observing season of OJ287. did a search for QPOs using several methods wide time domain. No statistically significant periods were found high frequency domain both ground data and also K2 observations. In longer Lomb-Scargle periodogram revealed peaks above 99\% significance level. The longest one, about 95-day, corresponds to ISCO period more massive SMBH. 43-day could be an alias or can attributed accretion form two armed spiral wave.
We present the discovery and characterization of six short-period, transiting giant planets from NASA's Transiting Exoplanet Survey Satellite (TESS) -- TOI-1811 (TIC 376524552), TOI-2025 394050135), TOI-2145 88992642), TOI-2152 395393265), TOI-2154 428787891), & TOI-2497 97568467). All orbit bright host stars (8.9