118 research outputs found
GENDERED READINGS OF RITUAL: EXPLORING NARRATIVES OF CHINESE RELIGION THROUGH NINETEENTH CENTURY CHRISTIAN MISSIONARY WRITINGS
This thesis presents gendered narratives of Chinese religion as revealed through the writings of late Nineteenth Century Christian missionaries. Through a recontextualized, material and practical approach to these sources I uncover examples of non-elite ritual practice. I utilize the personal experiences and philological work of Protestant men and women to explore instances of religion at two well-known sites of Chinese Buddhism, Putuoshan and Wutaishan. I reveal how religious adherents, both lay and ordained are classified and depicted though a Western Protestant lens. This exploration highlights how personal and non-elite narratives of Chinese religion produced by missionary women have been continually undervalued within the academic study of Chinese religion. I propose a means to overcome embedded Protestant biases within our own scholarly tradition through acknowledging the authority of ritual, of human action, within Chinese religion and within secondary missionary sources
New evidence about HW Vir's circumbinary planets from Hipparcos-Gaia astrometry and a reanalysis of the eclipse timing variations using nested sampling
The post common-envelope eclipsing binary HW Virginis has had many
circumbinary companions proposed based on eclipse timing variations. Each
proposed solution has lacked in predictability and orbital stability, leaving
the origin of the eclipse timing variations an active area of research.
Leveraging the catalogue of \textit{Hipparcos} and \textit{Gaia} proper motion
anomalies, we show there is slight evidence for a circumbinary companion
orbiting HW Vir. We place an upper limit in mass for such a companion which
excludes some previously claimed companions. We also apply this method to V471
Tauri and confirm the non-detection of a previously claimed brown dwarf. We
adapt the {\tt kima} nested sampling code to analyse eclipse timing variations
and re-analyse archival data on HW Vir, varying the order of the ephemeris that
we fit for and the amount of the data that we use. Although signals are clearly
present, we find two signals around 2500 and 4000 day periods that are not
coherent between different \textit{chunks} of the data, so are likely to not be
of planetary origin. We analyse the whole dataset and find the best solution to
contain four signals. Of these four we argue the outermost is the most
compatible with astrometry and thus the most likely to be of planetary nature.
We posit the other three pseudo-periodic signals are caused by physical
processes on the white dwarf. The eventual release of the full \textit{Gaia}
epoch astrometry is a promising way to confirm whether circumbinary planets
exist around HW Vir (and other similar systems), and explore white dwarf
physics.Comment: 10 pages, 5 figures, 5 tables, published in Monthly Notices of the
Royal Astronomical Societ
GJ 9404 b:A Confirmed Eccentric Planet, and not a Candidate
Eccentric orbits can be decomposed into a series of sine curves which affects
how the false alarm probability is computed when using traditional periodograms
on radial-velocity data. Here we show that a candidate exoplanet orbiting the M
dwarf GJ 9404, identified by the HADES survey using data from the HARPS-N
spectrograph, is in fact a bona-fide planet on a highly eccentric orbit. Far
from a candidate, GJ 9404 b is detected with a high confidence. We reach our
conclusion using two methods that assume Keplerian functions rather than sines
to compute a detection probability, a Bayes Factor, and the FIP periodogram. We
compute these using nested sampling with {\tt kima}.Comment: 3 pages, 1 figur
Improving circumbinary planet detections by fitting their binary's apsidal precession
Apsidal precession in stellar binaries is the main non-Keplerian dynamical
effect impacting the radial-velocities of a binary star system. Its presence
can notably hide the presence of orbiting circumbinary planets because many
fitting algorithms assume perfectly Keplerian motion. To first order, apsidal
precession () can be accounted for by adding a linear term to the
usual Keplerian model. We include apsidal precession in the kima package, an
orbital fitter designed to detect and characterise planets from radial velocity
data. In this paper, we detail this and other additions to kima that improve
fitting for stellar binaries and circumbinary planets including corrections
from general relativity. We then demonstrate that fitting for
can improve the detection sensitivity to circumbinary exoplanets by up to an
order of magnitude in some circumstances, particularly in the case of
multi-planetary systems. In addition, we apply the algorithm to several real
systems, producing a new measurement of aspidal precession in KOI-126 (a tight
triple system), and a detection of in the Kepler-16 circumbinary
system. Although apsidal precession is detected for Kepler-16, it does not have
a large effect on the detection limit or the planetary parameters. We also
derive an expression for the precession an outer planet would induce on the
inner binary and compare the value this predicts with the one we detect.Comment: 10 pages, 5 figures Re-submitted to MNRAS after reviewer comment
The EBLM project -- XIII. The absolute dynamical masses of the circumbinary planet host TOI-1338/BEBOP-1
High-contrast eclipsing binaries with low mass M-dwarf secondaries are
precise benchmark stars to build empirical mass-radius relationships for fully
convective low-mass () dwarf stars. The
contributed light of the M-dwarf in such binaries is usually much less than
one~per~cent at optical wavelengths. This enables the detection of circumbinary
planets from precise radial velocity measurements. High-resolution
cross-correlation techniques are typically used to detect exoplanet
atmospheres. One key aspect of these techniques is the post-processing, which
includes the removal of telluric and spectral lines of the host star. We
introduce the application of such techniques to optical high-resolution spectra
of the circumbinary planet-host TOI-1338/BEBOP-1, turning it effectively into a
double-lined eclipsing binary. By using simulations, we further explore the
impact of post-processing techniques for high-contrast systems. We detect the
M-dwarf secondary with a significance of 11- and measure absolute
dynamical masses for both components. Compared to previous model-dependent mass
measurements, we obtain a four times better precision. We further find that the
post-processing results in negligible systematic impact on the radial velocity
precision for TOI-1338/BEBOP-1 with more than per~cent (1-) of
the M-dwarf's signal being conserved. We show that these methods can be used to
robustly measure dynamical masses of high-contrast single-lined binaries
providing important benchmark stars for stellar evolution particularly near the
bottom of the main sequence. We also demonstrate how to retrieve the phase
curve of an exoplanet with high-resolution spectroscopy using our data.Comment: Accepted for publication in MNRAS, 17 pages, 13 image
A wider Europe? The view from Russia, Belarus and Ukraine
On the evidence of national surveys conducted between 2000 and 2006, there is a declining sense of European self-identity in the three Slavic post-Soviet republics of Russia, Belarus and Ukraine. Attitudes towards the European Union and the possibility of membership are broadly supportive, but with a substantial proportion who find it difficult to express a view, and substantial proportions are poorly informed in comparison with the general public in EU member or prospective member countries. Those who are better informed are more likely to favour EU membership and vice versa. Generally, socioeconomic characteristics (except for age and region) are relatively poor predictors of support for EU membership as compared with attitudinal variables. But ‘Europeanness’ should not be seen as a given, and much will depend on whether EU member countries emphasize what is common to east and west or establish ‘new dividing lines’ in place of those of the cold war
'The Germans are Hydrophobes': Germany and the Germans in the Shaping of French Identity
This article addresses issues of national identity and nationalism in the age of the French Revolution by looking at French attitudes towards the Germans. It engages with theories of nationalism while presenting empirical evidence gleaned from archival research. This material, sometimes grimly, sometimes rather amusingly, reveals much about French ideas and prejudices about the Germans and how it reflected back on the revolutionary and Napoleonic sense of what it meant to be French
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