scholarly journals A search for young exoplanets in Sectors 1–5 of the TESS full-frame images

2020 ◽  
Vol 496 (2) ◽  
pp. 1197-1216
Author(s):  
Matthew P Battley ◽  
Don Pollacco ◽  
David J Armstrong
Keyword(s):  
Opportunity To Learn ◽  
Young Stars ◽  
Eclipsing Binaries ◽  
Stellar Rotation ◽  
Complex Activity ◽  
Exoplanetary Systems ◽  
History Of ◽  
Stellar Associations ◽  
Host Stars ◽  
Initial Results

ABSTRACT Young (<1 Gyr) exoplanets represent a critically important area of exoplanet research, as they offer the opportunity to learn about the formation and early dynamic history of exoplanetary systems. However, finding young exoplanets is significantly complicated by the fast rotation and complex activity of their young host stars, which are often not well handled by state-of-the-art automatic pipelines. This work presents an alternative LOWESS-based pipeline focused specifically on detrending young stellar light curves from the 30-min cadence full-frame images produced by the Transiting Exoplanet Survey Satellite (TESS), and includes improvements such as automatic peak cutting of stellar variability and interpolation over masked transits to improve periodogram visibility and returned transit shapes. This work presents the details of the developed pipeline, along with initial results from its application to young stars within stellar associations in Sectors 1–5 of the TESS data. While no new exoplanet candidate signals were found in this work, interesting results included the recovery of all known 2-min TOIs around young stars in Sectors 1–5 from 30-min data alone, the recovery of the young exoplanet DS Tuc Ab, a number of young eclipsing binaries and a wide array of interesting rotation. A sensitivity analysis was also undertaken for each star, showing how the recovery of injected planets varied with both depth and period for each individual target. Challenges for future searches for young exoplanets are discussed, the largest being stellar rotation with periods less than 1 d and a lack of a large sample of confirmed young stars.

scholarly journals The effects of stellar winds and magnetic fields on exoplanets

2013 ◽  
Vol 9 (S302) ◽  
pp. 228-236 ◽  
Author(s):  
A. A. Vidotto
Keyword(s):  
Solar System ◽  
Interplanetary Medium ◽  
Great Majority ◽  
Stellar Winds ◽  
Stellar Rotation ◽  
Low Mass Stars ◽  
Exoplanetary Systems ◽  
Cool Stars ◽  
Low Mass ◽  
Host Stars

AbstractThe great majority of exoplanets discovered so far are orbiting cool, low-mass stars whose properties are relatively similar to the Sun. However, the stellar magnetism of these stars can be significantly different from the solar one, both in topology and intensity. In addition, due to the present-day technology used in exoplanetary searches, most of the currently known exoplanets are found orbiting at extremely close distances to their host stars (< 0.1 au). The dramatic differences in stellar magnetism and orbital radius can make the interplanetary medium of exoplanetary systems remarkably distinct from that of the Solar System. To constrain interactions between exoplanets and their host-star's magnetised winds and to characterise the interplanetary medium that surrounds exoplanets, more realistic stellar wind models, which account for factors such as stellar rotation and the complex stellar magnetic field configurations of cool stars, must be employed. Here, I briefly review the latest progress made in data-driven modelling of magnetised stellar winds. I also show that the interaction of the stellar winds with exoplanets can lead to several observable signatures, some of which that are absent in our own Solar System.

scholarly journals Resolved Stellar Populations of the interacting galaxies of the M81 group

2016 ◽  
Vol 11 (S321) ◽  
pp. 22-24
Author(s):  
Sakurako Okamoto ◽  
Nobuo Arimoto ◽  
Annette M.N. Ferguson ◽  
Edouard J. Bernard ◽  
Mike J. Irwin ◽  
...  
Keyword(s):  
Main Sequence ◽  
Field Survey ◽  
State Of The Art ◽  
Young Stars ◽  
Interacting Galaxies ◽  
Wide Field ◽  
Red Giant ◽  
Tidal Streams ◽  
Stellar Associations ◽  
First Time

AbstractWe present the results from the state-of-the-art wide-field survey of the M81 galaxy group that we are conducting with Hyper Suprime-Cam on Subaru Telescope. Our photometry reaches about 2 mag below the tip of the red giant branch (RGB) and reveals the spatial distribution of both old and young stars over an area of 5°2around the M81. The young main-sequence (MS) stars closely follow the HI distribution and can be found in a stellar stream between M81 and NGC 3077 and in numerous outlying stellar associations. Our survey also reveals for the first time the very extended (>2 × R25) halos of RGB stars around M81, M82, and NGC 3077, as well as faint tidal streams that link these systems. The gravitational interactions between M81, M82 and NGC 3077 galaxies induced star formation in tidally stripped gas, and also significantly perturbed the older stellar components leading to disturbed halo morphologies.

scholarly journals On the alignment of debris discs and their host stars’ rotation axis - implications for spin-orbit misalignment in exoplanetary systems

2011 ◽  
Vol 413 (1) ◽  
pp. L71-L75 ◽  
Author(s):  
C. A. Watson ◽  
S. P. Littlefair ◽  
C. Diamond ◽  
A. Collier Cameron ◽  
A. Fitzsimmons ◽  
...  
Keyword(s):  
Rotation Axis ◽  
Spin Orbit ◽  
Exoplanetary Systems ◽  
Host Stars

Real-World Experience with Type I Endoleaks after Endovascular Repair of the Thoracic Aorta

2010 ◽  
Vol 76 (6) ◽  
pp. 599-605 ◽  
Author(s):  
Joshua D. Adams ◽  
Margaret C. Tracci ◽  
Sahir Sabri ◽  
Kenneth J. Cherry ◽  
John F. Angle ◽  
...  
Keyword(s):  
Natural History ◽  
Thoracic Endovascular Aortic Repair ◽  
Spontaneous Resolution ◽  
Type I ◽  
Single Center ◽  
Type I Endoleak ◽  
History Of ◽  
Aortic Pathologies ◽  
Initial Results

Endoleaks are a frequent complication of thoracic endovascular aortic repair (TEVAR) and will likely increase in incidence with application of the technique to more complicated aortic anatomy and a wider range of thoracic aortic pathologies. Management generally consists of aggressive repair of Type I endoleaks; however, the natural history of Type I endoleaks after TEVAR remains largely unknown. The purpose of this study was to examine the incidence and characteristics of Type I endoleaks and to evaluate clinical outcomes of patients with Type I endoleaks after TEVAR. A single-center retrospective review was performed on all patients who underwent TEVAR over a 4-year period. Type I endoleaks were detected in 21 per cent (27 of 129) of patients on post-deployment aortography or CT angiography. During a mean follow-up of 750.63 ± 483 days, 59 per cent (16 of 27) closed spontaneously; 30 per cent (eight of 27) required secondary endovascular intervention; and 11 per cent (three of 27) have persisted with no increase in maximum aortic diameter. No patients have died or required open surgical conversion as a result of their Type I endoleak. Although accurate predictors of spontaneous resolution of Type I endoleaks have yet to be definitively characterized, our initial results suggest that it may be safe to observe small Type I endoleaks given that a large percentage resolve spontaneously and no endoleak-related deaths have occurred.

scholarly journals Analysis of the Value and Advantages of Financial Literacy and Digitalization to the Individual

2021 ◽  
Vol 2 (2) ◽  
pp. 141-152
Author(s):  
Afzal Sayed Munna ◽  
Rehana Khanam
Keyword(s):  
Financial Literacy ◽  
Digital Literacy ◽  
Teaching And Learning ◽  
Research Study ◽  
Opportunity To Learn ◽  
Financial Capability ◽  
Management Level ◽  
History Of ◽  
Digital Knowledge ◽  
The Individual

Digital literacy is the ability to analyse, evaluate and create a teaching and learning media which enables adults and youth to understand complex communication, Aufderheide (1993). Therefore, this research study has examined how digital knowledge could provide an opportunity to learn financial capability. Fintech has transformed the history of the financial sectors and places an individual at significant advantages. However, Bankers, Teachers, Information Technology (IT) professionals and university students were selected for the research study from Bangladesh and England. Interviews were conducted with management level professionals. Survey and test questionnaires were developed and randomly directed to other participants to measure their financial and ICT knowledge. The research findings have found that present financial decision making, and the growth of assets depends on an individual adult’s financial capability.

scholarly journals Host-star and exoplanet compositions: a pilot study using a wide binary with a polluted white dwarf

2021 ◽  
Vol 503 (2) ◽  
pp. 1877-1883
Author(s):  
Amy Bonsor ◽  
Paula Jofré ◽  
Oliver Shorttle ◽  
Laura K Rogers ◽  
Siyi Xu(许偲艺) ◽  
...  
Keyword(s):  
White Dwarf ◽  
Planetary System ◽  
Kuiper Belt ◽  
Wide Binary ◽  
Elemental Abundances ◽  
Exoplanetary Systems ◽  
Planetary Bodies ◽  
Refractory Composition ◽  
Observational Errors ◽  
Host Stars

ABSTRACT Planets and stars ultimately form out of the collapse of the same cloud of gas. Whilst planets, and planetary bodies, readily loose volatiles, a common hypothesis is that they retain the same refractory composition as their host star. This is true within the Solar system. The refractory composition of chondritic meteorites, Earth, and other rocky planetary bodies are consistent with solar, within the observational errors. This work aims to investigate whether this hypothesis holds for exoplanetary systems. If true, the internal structure of observed rocky exoplanets can be better constrained using their host star abundances. In this paper, we analyse the abundances of the K-dwarf, G200-40, and compare them to its polluted white dwarf companion, WD 1425+540. The white dwarf has accreted planetary material, most probably a Kuiper belt-like object, from an outer planetary system surviving the star’s evolution to the white dwarf phase. Given that binary pairs are chemically homogeneous, we use the binary companion, G200-40, as a proxy for the composition of the progenitor to WD 1425+540. We show that the elemental abundances of the companion star and the planetary material accreted by WD 1425+540 are consistent with the hypothesis that planet and host-stars have the same true abundances, taking into account the observational errors.

Thinking Transnationally

2019 ◽  
pp. 165-185
Author(s):  
Margarita María Sánchez
Keyword(s):  
Educational Opportunity ◽  
Forced Migration ◽  
Opportunity To Learn ◽  
The United States ◽  
Great Opportunity ◽  
Migrant Families ◽  
History Of ◽  
The Individual ◽  
The Impact

Wagner College is participating in a ground-breaking project that brings migrant families together after years of separation. This project has been not only inspirational for both faculty members and students, but is also a great opportunity to learn about forced migration and alternatives to keep families together. The “Transnational Project: San Jerónimo Xayacatlán-Port Richmond” was created to connect communities in both the United States and Mexico and to preserve their cultural identities that have been threatened by forced migration. In this chapter, I would like to present the project focusing on three aspects: the history of the project, the individual stories of members who migrated and of those who stayed in their homeland, and the impact of this educational opportunity in the classroom. I will use a series of interviews with the members of Ñani Migrante (the group formed by the members of both the San Jerónimo and the Port Richmond communities), the presentations of both panels that took place at Wagner College, and the reflections of students who attended them.

Thinking Transnationally

2016 ◽  
pp. 230-250 ◽  
Author(s):  
Margarita María Sánchez
Keyword(s):  
Educational Opportunity ◽  
Forced Migration ◽  
Opportunity To Learn ◽  
The United States ◽  
Great Opportunity ◽  
Migrant Families ◽  
History Of ◽  
The Individual ◽  
The Impact

Wagner College is participating in a ground-breaking project that brings migrant families together after years of separation. This project has been not only inspirational for both faculty members and students, but is also a great opportunity to learn about forced migration and alternatives to keep families together. The “Transnational Project: San Jerónimo Xayacatlán-Port Richmond” was created to connect communities in both the United States and Mexico and to preserve their cultural identities that have been threatened by forced migration. In this chapter, I would like to present the project focusing on three aspects: the history of the project, the individual stories of members who migrated and of those who stayed in their homeland, and the impact of this educational opportunity in the classroom. I will use a series of interviews with the members of Ñani Migrante (the group formed by the members of both the San Jerónimo and the Port Richmond communities), the presentations of both panels that took place at Wagner College, and the reflections of students who attended them.

scholarly journals Telescope Observations of Interstellar and Circumstellar Ices: Successes of and Need for Laboratory Simulations

2015 ◽  
Vol 11 (A29A) ◽  
pp. 317-318
Author(s):  
A. C. A. Boogert
Keyword(s):  
Thermal Processing ◽  
Protoplanetary Disks ◽  
Building Blocks ◽  
Reaction Rates ◽  
Young Stars ◽  
Complex Molecules ◽  
Laboratory Simulations ◽  
James Webb Space Telescope ◽  
History Of ◽  
Grain Surface

AbstractIces play a key role in the formation of simple and complex molecules in dense molecular clouds and in the envelopes and protoplanetary disks surrounding young stars. Some fraction of the interstellar ices may become building blocks of comets, and thus be delivered to the early Earth. Laboratory simulations have proven to be crucial in the derivation of ice abundances, in quantifying reaction rates on cold grain surfaces, in determining the thermal and energetic processing history of the ices, and in understanding the interaction between the ices and the underlying refractory grain surfaces. In this invited topical paper I will review possible ways forward in improving our knowledge of the composition of the ices, as many signatures in the interstellar spectra are still poorly identified. I will also emphasize the observed importance of thermal processing of the ices (crystallization, segregation), which likely affects the chemistry after the initial dominance of grain surface reactions. Continued laboratory work is warranted in view of the upcoming observational data from, for example, the James Webb Space Telescope (JWST), which is ideally suited for ices studies. For an exhaustive review on this topic I refer to Boogert, Gerakines & Whittet (2015).

scholarly journals Different types of star-planet interactions

2019 ◽  
Vol 15 (S354) ◽  
pp. 259-267
Author(s):  
A. A. Vidotto
Keyword(s):  
Physical Characteristics ◽  
Electromagnetic Spectrum ◽  
Exoplanetary Systems ◽  
Different Types ◽  
Host Stars

AbstractStars and their exoplanets evolve together. Depending on the physical characteristics of these systems, such as age, orbital distance and activity of the host stars, certain types of star-exoplanet interactions can dominate during given phases of the evolution. Identifying observable signatures of such interactions can provide additional avenues for characterising exoplanetary systems. Here, I review some recent works on star-planet interactions and discuss their observability at different wavelengths across the electromagnetic spectrum.

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