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#kepler

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Mikko Tuomi

First first-author paper by my PhD researcher Andras Haris. Not formally accepted yet, but major hurdles cleared.

He has analysed 3273 space telescope #transit light curves of 99 #planets, and identified 105 candidates for #starspot occultation events by six planets.

Homogeneous search for spot transits in #Kepler and #TESS photometry of K − M-type main-sequence #stars

#astronomy #astrophysics
arxiv.org/abs/2502.18129

arXiv.orgHomogeneous search for spot transits in Kepler and TESS photometry of K $-$ M-type main-sequence starsLate-type stars are known to host numerous exoplanets, and their photometric variability, primarily caused by rotational modulation, provides a unique opportunity to study starspots. As exoplanets transit in front of their host stars, they may occult darker, spotted regions on the stellar surfaces. The monitoring of starspots from planetary transits, known as transit mapping, offers a possibility to detect small dark regions on magnetically active, late-type stars. These spots may be so small that they would be undetectable to other methods used to reconstruct stellar magnetic activity. We describe a Bayesian analysis framework on the transit light curves of planets orbiting K- and M-type main-sequence stars in search for spot occultation event candidates. We present a systematic analysis of high-precision, high-cadence light curves from Kepler and TESS to detect and characterise starspots during exoplanetary transits. According to our tests, the set of criteria applied in the analysis is robust and not prone to false positives. Our sample comprises K- and M-dwarfs hosting transiting exoplanets observed by the Kepler or TESS space telescopes at a high cadence, totalling 99 planets meeting our selection criteria. After analysing 3273 transit light curves from 99 planets, we find 105 candidates for starspot occultation events by six planets. We report new spot occultation candidates for the K-dwarfs HD 189733 and TOI-1268. The identified dark regions have a lower limit for radii between 1.6 degrees and 29.5 degrees and contrasts up to 0.69. We estimate a spot detection frequency of 3.7% and 4.2% for K- and M-dwarfs by TESS, and 37.5% for K-dwarfs by Kepler.
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Nicolas Glade

#Astrophotography of Orion captured 2 nights ago. [slightly enhanced]
56x180s exp time (with L-Enhance #optolongfilters) + 39x30s (without filter) + DOF, #canon 1200D defiltered, 800 iso, #Skywatcher Netwonian 150/750 and AZ-EQ5 mount, coma corrector, PHD2 Guiding with #kepler 50/162 lens + Asi #Zwo 120mm + #Astroberry on a #raspberrypi 3.
flic.kr/p/2qKmBx6
#photo #photography. #space #deepskyphotography #deepsky #telescope

FlickrGrande nébuleuse d'Orion (M42)By nicolas.glade
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TOV

What happened to the Kepler GeForce 600 and 700 series GPUs?

Announcement
Nvidia first announced the Kepler architecture in September 2010

Release
Nvidia released its Kepler GPU microarchitecture in April 2012.

Unsupported
NVIDIA officially stopped supporting drivers for the Kepler GPU architecture on August 2021.

#Nvidia#Kepler#GeForce
Public
Ele Willoughby, PhD

Also, in honour of his birthday: Kepler’s Somnium. This hand-printed linocut illustrates astronomer and mathematician Johannes Kepler’s science fiction story Somnium, or “The Dream”. Kepler (1571-1630) wrote the strange manuscript in Latin, and circulated it amongst friends, with the intention of eventually publishing it but he died before that could could happen. (It also escaped his control 🧵1/n

My linocut print of Kepler’s Somnium (or Dream) in darkest blue on white with chine collé collaged papers for aliens. It shows the Earth in space viewed from the mountainous moon where a boy and daemon in a cave view the giant serpent like creature (on marbled paper in swirling pink, orange and blue) and three pinecone shaped creatures on pink, peach and turquoise paper.
#linocut#printmaking#histsci
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TOV

OBS Studio 31.0.0 was released. In this version, NVIDIA Kepler (600 and 700 series) GPUs are no longer supported for NVENC.

The Kepler microarchitecture is a GPU design from Nvidia that was used in the GeForce 600 and 700 series graphics cards, as well as some GeForce 800M series GPUs. NVIDIA first released Kepler back in April 2012.

#OBS#nvidia#kepler
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Ele Willoughby, PhD

For the #Spacetober prompt orbit: my portrait of #mathematician and #astronomer Johannes Kepler (1571-1630)! We remember him for his role in the Scientific Revolution, and his three laws of planetary motion in particular. His laws modified Copernicus’ heliocentric model; he replaced the circular orbits with elliptical ones & described velocities of planets. Today we know them as:
🧵1/n

#sciart #histsci #MastoArt #Kepler #geometry #PlatonicSolids #mathematics #musicOfTheSpheres #linocut

My linocut portrait of Johannes Kepler on cream coloured washi paper. Kepler is in Renaissance garb printed in indigo. He holds a compass and rests his hand on his model of nested Platonic solids from Mysterium Cosmographicum, printed in gold ink. Above that in silver in are 7 musical staves with notes next to symbols for related planetary bodies: Mercury, Venus, Earth and Moon, Mars, Jupiter and Saturn. Over his other shoulder are 3 schematic diagrams drawn in ellipses (oriented with the semi-major axes horizontal) in magenta. The top one relates to his first law and shows an ellipse cut in two horizontally, the two foci labelled F and F’ and a triangle drawn to a point P on the ellipse (FPF’). The middle ellipse (2nd law) shows the Sun at a focus, and a series of circles on the ellipse as a planet such that the sections are equal area and alternate colouring (magenta or none) like a peppermint. The bottom ellipse (3rd law) is cut in half with semi-major and semi-minor axes shown
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Bibliolater 📚 📜 🖋

🔴 Analyses of Johannes Kepler’s Sunspot Drawings in 1607: A Revised Scenario for the Solar Cycles in the Early 17th Century

“Here, we make use of Kepler’s sunspot drawings and descriptive texts to identify his observational sites and time stamps. We have deprojected his sunspot drawings and compared the reported positions with our calculations of the inclination of the solar equator as seen from these sites at that time.”

Hayakawa, H. et al. (2024) ‘Analyses of Johannes Kepler’s Sunspot Drawings in 1607: A revised scenario for the solar cycles in the early 17th century,’ The Astrophysical Journal Letters, 970(2), p. L31. doi.org/10.3847/2041-8213/ad57.

#OpenAccess #OA #Research #DOI #Science #Astronomy #Sun #History #HistSci #Kepler #C17th #17thcentury #Academia #Academic #Academics @science @astronomy

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