Context. The Transiting Exoplanet Survey Satellite (TESS) is observing bright known planet-host stars across almost the entire sky. These stars have been subject to extensive ground-based ...observations, providing a large number of radial velocity measurements. Aims. The objective of this work is to use the new TESS photometric observations to characterize the star λ2 Fornacis, and following this to update the parameters of the orbiting planet λ2 For b. Methods. We measured the frequencies of the p-mode oscillations in λ2 For, and in combination with non-seismic parameters estimated the stellar fundamental properties using stellar models. Using the revised stellar properties and a time series of archival radial velocities from the UCLES, HIRES and HARPS instruments spanning almost 20 years, we refit the orbit of λ2 For b and searched the residual radial velocities for remaining variability. Results. We find that λ2 For has a mass of 1.16 ± 0.03 M⊙ and a radius of 1.63 ± 0.04 R⊙, with an age of 6.3 ± 0.9 Gyr. This and the updated radial velocity measurements suggest a mass of λ2 For b of 16.8−1.3+1.2 M⊕, which is ∼5M⊕ less than literature estimates. We also detect an additional periodicity at 33 days in the radial velocity measurements, which is likely due to the rotation of the host star. Conclusions. While previous literature estimates of the properties of λ2 For are ambiguous, the asteroseismic measurements place the star firmly at the early stage of its subgiant evolutionary phase. Typically only short time series of photometric data are available from TESS, but by using asteroseismology it is still possible to provide tight constraints on the properties of bright stars that until now have only been observed from the ground. This prompts a reexamination of archival radial velocity data that have been accumulated in the past few decades in order to update the characteristics of the planet hosting systems observed by TESS for which asteroseismology is possible.
A case of aggressive Juvenile ossifying fibroma in a child has been discussed. The unique appearance of this particular lesion demonstrates a close relationship between aggressive ossifying fibroma ...and well-differentiated osteogenic sarcoma. The age of the patient and the location of the tumor in the case presented made it mandatory to utilize multiple diagnostic parameters and adjunctive diagnostic help to resolve the dilemma posed by this tumor. Differentiation of ossifying fibroma from other benign and malignant neoplasms as well as fibrous dysplasia is important in correct management of the lesion.
Context.
The Transiting Exoplanet Survey Satellite (TESS) is observing bright known planet-host stars across almost the entire sky. These stars have been subject to extensive ground-based ...observations, providing a large number of radial velocity measurements.
Aims.
The objective of this work is to use the new TESS photometric observations to characterize the star
λ
2
Fornacis
, and following this to update the parameters of the orbiting planet
λ
2
For b
.
Methods.
We measured the frequencies of the
p
-mode oscillations in
λ
2
For
, and in combination with non-seismic parameters estimated the stellar fundamental properties using stellar models. Using the revised stellar properties and a time series of archival radial velocities from the UCLES, HIRES and HARPS instruments spanning almost 20 years, we refit the orbit of
λ
2
For b and searched the residual radial velocities for remaining variability.
Results.
We find that
λ
2
For has a mass of 1.16 ± 0.03
M
⊙
and a radius of 1.63 ± 0.04
R
⊙
, with an age of 6.3 ± 0.9 Gyr. This and the updated radial velocity measurements suggest a mass of
λ
2
For b of 16.8
−1.3
+1.2
M
⊕
, which is ∼5
M
⊕
less than literature estimates. We also detect an additional periodicity at 33 days in the radial velocity measurements, which is likely due to the rotation of the host star.
Conclusions.
While previous literature estimates of the properties of
λ
2
For are ambiguous, the asteroseismic measurements place the star firmly at the early stage of its subgiant evolutionary phase. Typically only short time series of photometric data are available from TESS, but by using asteroseismology it is still possible to provide tight constraints on the properties of bright stars that until now have only been observed from the ground. This prompts a reexamination of archival radial velocity data that have been accumulated in the past few decades in order to update the characteristics of the planet hosting systems observed by TESS for which asteroseismology is possible.
Underwater Exploration and Cleaning Drone Telsang, Supriya S.; Ranadive, Ishan P.; Rane, Chinmay D. ...
International Journal for Research in Applied Science and Engineering Technology,
6/2024, Letnik:
12, Številka:
6
Journal Article
The project aims to produce a novel drone that can move underwater with remote control and communicate with the server on its own drones make it possible to explore far-offlocations that are not ...accessible by foot. However, it is difficult to determine various parameters of water due to insufficient tools and access. Combining a camera and sensors gives a spatial understanding of water. However such kinds of designsare complex due to the presence of different sensors and the capability of drones to function all of them while carrying them in water. We introduce a novel drone technology system for cleaning, exploration, and water quality monitoring in this research.The drone can sample and analyze water, showing real-time images, pH value, and TDS value, and checking ifthe water is turbid. The drone is controlled by wireless Bluetooth technology which helps to establish contact with the drone underwater. Arduino UNO is used to make sensors, andthe values obtained from the gathered data are displayed on the mobile screen.
A&A 641, A25 (2020) The Transiting Exoplanet Survey Satellite (TESS) is observing bright known
planet-host stars across almost the entire sky. These stars have been subject
to extensive ground-based ...observations, providing a large number of radial
velocity (RV) measurements. In this work we use the new TESS photometric
observations to characterize the star $\lambda^2$ Fornacis, and following this
to update the parameters of the orbiting planet $\lambda^2$ For b. We measure
the p-mode oscillation frequencies in $\lambda^2$ For, and in combination with
non-seismic parameters estimate the stellar fundamental properties using
stellar models. Using the revised stellar properties and a time series of
archival RV data from the UCLES, HIRES and HARPS instruments spanning almost 20
years, we refit the orbit of $\lambda^2$ For b and search the RV residuals for
remaining variability. We find that $\lambda^2$ For has a mass of
$1.16\pm0.03$M$_\odot$ and a radius of $1.63\pm0.04$R$_\odot$, with an age of
$6.3\pm0.9$Gyr. This and the updated RV measurements suggest a mass of
$\lambda^2$ For b of $16.8^{+1.2}_{-1.3}$M$_\oplus$, which is $\sim5$M$_\oplus$
less than literature estimates. We also detect a periodicity at 33 days in the
RV measurements, which is likely due to the rotation of the host star. While
previous literature estimates of the properties of $\lambda^2$ are ambiguous,
the asteroseismic measurements place the star firmly at the early stage of its
subgiant evolutionary phase. Typically only short time series of photometric
data are available from TESS, but by using asteroseismology it is still
possible to provide tight constraints on the properties of bright stars that
until now have only been observed from the ground. This prompts a reexamination
of archival RV data from the past few decades to update the characteristics of
the planet hosting systems observed by TESS for which asteroseismology is
possible.
One of the most researched topics in parallel programming is data dependency analysis and data write detection analysis. Traditionally researchers have used mathematical models to identify conflicts ...in a complex code. The accuracy of such results, however, depends on the correctness of the mathematical model. Additionally, implementation of a mathematical model is a huge task by itself. In this paper, we discuss three techniques for data dependency analysis namely duplicate variables, page fault interrupt, and debug registers. The techniques are discussed in details using sample C programs. However, these techniques can be extended to other programming languages as well. We further discuss the merits and demerits of each of the techniques.
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