English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Recently, high-precision optical 2~min cadence light curves obtained with\emph{TESS} for targets located in the mission's defined first four sectorshave been released. The majority of these high-cadence and high-precisionmeasurements currently span $\sim28\,{\rm d}$, thereby allowing periodicvariability occurring on timescales $\lesssim14\,{\rm d}$ to potentially bedetected. Magnetic chemically peculiar (mCP) A-type stars are well known toexhibit rotationally modulated photometric variability that is produced byinhomogeneous chemical abundance distributions in their atmospheres. While mCPstars typically exhibit rotation periods that are significantly longer thanthose of non-mCP stars, both populations exhibit typical periods$\lesssim10\,{\rm d}$; therefore, the early \emph{TESS} releases are suitablefor searching for rotational modulation of the light curves of both mCP andnon-mCP stars. We present the results of our search for A-type stars thatexhibit variability in their \emph{TESS} light curves that is consistent withrotational modulation based on the first two data releases obtained fromsectors 1 to 4. Our search yielded $134$ high-probability candidate rotationalvariables -- $60$ of which have not been previously reported. Approximatelyhalf of these stars are identified in the literature as Ap (mCP) stars.Comparisons between the subsample of high-probability candidate rotationallyvariable Ap stars and the subsample of stars that are not identified as Apreveal that the latter subsample exhibits statistically (i) shorter rotationperiods and (ii) significantly lower photometric amplitudes.

MOBSTER - II. Identification of rotationally variable A stars observed with \emph{TESS} in Sectors 1 to 4