Abstract
We report the discovery of two short-period Saturn-mass planets, one transiting the G subgiant TOI-954 (TIC 44792534,
V
= 10.343,
T
= 9.78) observed in TESS sectors 4 and 5 and one ...transiting the G dwarf K2-329 (EPIC 246193072,
V
= 12.70,
K
= 10.67) observed in K2 campaigns 12 and 19. We confirm and characterize these two planets with a variety of ground-based archival and follow-up observations, including photometry, reconnaissance spectroscopy, precise radial velocity, and high-resolution imaging. Combining all available data, we find that TOI-954 b has a radius of
and a mass of
M
J
and is in a 3.68 day orbit, while K2-329 b has a radius of
and a mass of
M
J
and is in a 12.46 day orbit. As TOI-954 b is 30 times more irradiated than K2-329 b but more or less the same size, these two planets provide an opportunity to test whether irradiation leads to inflation of Saturn-mass planets and contribute to future comparative studies that explore Saturn-mass planets at contrasting points in their lifetimes.
Dataset of annual monitoring of herbivory effects on the conservation status of the endangered species
(Lange) K. Richt and its associated plant communities is presented in this manuscript. This ...dataset encompasses the annual monitoring of herbivory effects on the conservation status of the endangered species
. Since 2010, the SERPAM Department (Service of Evaluation, Restoration and Protection of Mediterranean Agrosystems) at the Zaidin Experimental Station, belonging to the Spanish National Research Council (CSIC-EEZ), has conducted annual sampling to assess the impact of both domestic and wild livestock, specifically rabbits, on the pastures where
lives. The study consisted of a randomised block design, implementing three distinct treatments to evaluate different management strategies: (1) rabbit and domestic herbivory, (2) exclusion of domestic livestock and (3) exclusion of rabbits and domestic livestock. Within each treatment, two types of monitoring were conducted. Firstly, the abundance of
was estimated by counting individuals within 50 cm x 50 cm quadrats. Secondly, plant species diversity was assessed along 2-m long transects using the modified Point-Quadrat method. The research was conducted within the Cabo de Gata-Níjar Natural Park in southern Spain, specifically in the Amoladeras Nature Reserve in Almería.
The dataset contains information spanning from 2010 to 2023, providing valuable insights into the annual monitoring of herbivory effects on the conservation status of
, contributing to our understanding of the species' interaction with domestic and wild animal in the studied area.
Sulphur abundance in Galactic stars Caffau, E.; Bonifacio, P.; Faraggiana, R. ...
Astronomy and astrophysics (Berlin),
10/2005, Letnik:
441, Številka:
2
Journal Article
Recenzirano
Odprti dostop
We investigate sulphur abundance in 74 Galactic stars by using high resolution spectra obtained at ESO VLT and NTT telescopes. For the first time the abundances are derived, where possible, from ...three optical multiplets: Mult. 1, 6, and 8. By combining our own measurements with data in the literature we assemble a sample of 253 stars in the metallicity range $\rm -3.2 \la Fe/H \la +0.5$. Two important features, which could hardly be detected in smaller samples, are obvious from this large sample: 1) a sizeable scatter in S/Fe ratios around Fe/H$\sim -1; 2$) at low metallicities we observe stars with S/Fe$\sim 0.4$, as well as stars with higher S/Fe ratios. The latter do not seem to be kinematically different from the former ones. Whether the latter finding stems from a distinct population of metal-poor stars or simply from an increased scatter in sulphur abundances remains an open question.
Digital video capturing is getting popular with the decreasing price of camcorders and the increasing availability of devices with embedded video cameras such as digital-still cameras, mobile phones ...and PDAs. While a raw home video is considered as visually non-appealing, having multiple recordings of the same event provides the opportunity to combine audio and video segments from different cameras for improving quality and aesthetics. Mixing content from different recordings requires precise synchronization among the recordings. In most present applications, synchronization is done manually and considered as a very tedious task. In this paper, we propose a novel automated synchronization approach based on detecting and matching audio and video features extracted from the recorded content. We assess experimentally three realizations of this approach on a common data set and make recommendations on the usability of the different realizations in practical use cases. The realizations have no limitations on the number and movement of the cameras. Moreover, they are robust against various ambient noises and audio-visual artifacts occurring during the recordings.
A large number of videos are captured and shared by the audience from musical concerts. However, such recordings are typically perceived as boring mainly because of their limited view, poor visual ...quality and incomplete coverage. It is our objective to enrich the viewing experience of these recordings by exploiting the abundance of content from multiple sources. In this paper, we propose a novel \Virtual Director system that automatically combines the most desirable segments from different recordings resulting in a single video stream, called mashup. We start by eliciting requirements from focus groups, interviewing professional video editors and consulting film grammar literature. We design a formal model for automatic mashup generation based on maximizing the degree of fulfillment of the requirements. Various audio-visual content analysis techniques are used to determine how well the requirements are satisfied by a recording. To validate the system, we compare our mashups with two other mashups: manually created by a professional video editor and machine generated by random segment selection. The mashups are evaluated in terms of visual quality, content diversity and pleasantness by 40 subjects. The results show that our mashups and the manual mashups are perceived as comparable, while both of them are significantly higher than the random mashups in all three terms.
Planetary formation in the γ Cephei system Thébault, P.; Marzari, F.; Scholl, H. ...
Astronomy and astrophysics (Berlin),
12/2004, Letnik:
427, Številka:
3
Journal Article
Recenzirano
Odprti dostop
We numerically investigate under which conditions the planet detected at 2.1 AU from γ Cephei could form through the core-accretion scenario despite the perturbing presence of the highly eccentric ...companion star. We first show that the initial stage of runaway accretion of kilometer-sized planetesimals is possible within 2.5 AU from the central star only if large amounts of gas are present. In this case, gaseous friction induces periastron alignment of the orbits which reduces the otherwise high mutual impact velocities due to the companion's secular perturbations. The following stage of mutual accretion of large embryos is also modeled. According to our simulations, the giant impacts among the embryos always lead to a core of 10 $M_{\oplus}$ within 10 Myr, the average lifetime of gaseous discs. However, the core always ends up within 1.5 AU from the central star. Either the core grows more quickly in the inner region of the disc, or it migrates inside by scattering the residual embryos.
Noise properties of the CoRoT data Aigrain, S.; Pont, F.; Fressin, F. ...
Astronomy and astrophysics (Berlin),
10/2009, Letnik:
506, Številka:
1
Journal Article, Web Resource
Recenzirano
Odprti dostop
In this short paper, we study the photometric precision of stellar light curves obtained by the CoRoT satellite in its planet-finding channel, with a particular emphasis on the time scales ...characteristic of planetary transits. Together with other articles in the same issue of this journal, it forms an attempt to provide the building blocks for a statistical interpretation of the CoRoT planet and eclipsing binary catch to date. After pre-processing the light curves so as to minimise long-term variations and outliers, we measure the scatter of the light curves in the first three CoRoT runs lasting more than 1 month, using an iterative non-linear filter to isolate signal on the time scales of interest. The behaviour of the noise on 2 h time scales is described well by a power-law with index 0.25 in R-magnitude, ranging from 0.1 mmag at R=11.5 to 1 mmag at R=16, which is close to the pre-launch specification, though still a factor 2-3 above the photon noise due to residual jitter noise and hot pixel events. There is evidence of slight degradation in the performance over time. We find clear evidence of enhanced variability on hour time scales (at the level of 0.5 mmag) in stars identified as likely giants from their R magnitude and B-V colour, which represent approximately 60 and 20% of the observed population in the directions of Aquila and Monoceros, respectively. On the other hand, median correlated noise levels over 2 h for dwarf stars are extremely low, reaching 0.05 mmag at the bright end.
Synchronization of multi-camera video recordings based on audio Shrstha, Prarthana; Barbieri, Mauro; Weda, Hans
International Multimedia Conference: Proceedings of the 15th international conference on Multimedia; 25-29 Sept. 2007,
09/2007
Conference Proceeding
An increasing number of people regularly capture video in social occasions like weddings, parties and holiday trips. As a result, multiple video recordings are made from a single event providing ...different view angles and wider coverage. This gives an opportunity to produce a desired video summary from the event, combining the videos with the most favorable views from multiple recordings. In order to mix contents from different cameras, the recordings require very precise synchronization in time. This task is very tedious and presently done manually. We present two methods to synchronize multiple videos based on the identical audio content present in the recordings. The first method utilizes audio-classification and the synchronization between two recordings is determined by correlating the audio classes. The second method uses audio-fingerprints to represent the recorded audio. The synchronization is determined by fingerprint matches between the different recordings. The experimental results show that the audio-classification method requires recordings, at least a couple of minutes long, with large temporal overlap to determine the synchronization point. The method using audio-fingerprints requires at least 3 second long overlapping audio and resulted inperfect synchronization in all the examined cases.
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