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Ian Czekala14/01/2025, 09:55
Circumbinary planets form from material in protoplanetary disks. Therefore it is reasonable to expect that planets would inherit their orbits from the distribution of this material, at least in a broad and initial sense. In this talk, I will review observations of circumbinary material across stellar ages: from the earliest protostellar and class 0/I systems, through the "classic" class II...
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Maria Jose Maureira14/01/2025, 10:30
The physical properties and dynamics of the youngest multiple protostellar systems and their disks have remained largely unconstrained due to their embedded nature. In this talk, I will discuss recent high-resolution ALMA observations, which are beginning to resolve the gas and dust emission within individual and circumbinary disk structures during the earliest stages of formation. These...
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Stefan Kraus14/01/2025, 11:35
Pre-main-sequence binary systems provide a unique laboratory for studying dynamical truncation in discs. We studied the inner region of a nearby Herbig Ae/Be binary system using the VLTI/GRAVITY and VLTI/PIONIER instrument. Spectrally-dispersed interferometry with GRAVITY allowed us to determine the origin of the Br γ line emission and to study how the accretion rates on the primary and...
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Anibal Sierra14/01/2025, 12:10
Detecting signatures of planet formation in protoplanetary disks is essential for understanding how and where planets form. In this talk, I will present dust and gas observations of the disk around 2MASS J16120668-301027, studied as part of the ALMA Large Program 'AGE-PRO: ALMA Survey of Gas Evolution in Protoplanetary Disks,' where several indicators of planet formation were recently...
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Matthew Bate14/01/2025, 14:00
I will discuss the formation mechanisms and resulting properties of stellar binary systems that are obtained from radiation hydrodynamical simulations of star cluster formation. I will also discuss the properties of the protoplanetary discs that are formed with these systems, concentrating on the frequencies and properties of circumbinary discs.
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Dong Lai14/01/2025, 14:35
I will discuss the hydrodynamics of circumbinary disks and how it impacts the binary evolution of the formation of planets.
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Enrico Ragusa14/01/2025, 15:10
Systems where two gravitationally bound masses (the primary mass and its binary companion) interact with the surrounding gas and dust are extremely common in the Universe and encompassing a wide variety of different astrophysical systems, from stars and planets to black holes. Extensive theoretical and numerical work from the late 1970s revealed that the material in the surroundings of...
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Jeremy Smallwood14/01/2025, 16:15
Most stars born in dense stellar clusters are part of binary star systems. Circumbinary discs of gas and dust commonly surround binary star systems. Misalignments between the circumbinary disc and the binary orbital plane are widely observed. A misaligned circumbinary disc undergoes nodal precession. For a low initial inclination, the precession is around the binary angular momentum vector,...
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Arnaud Pierens14/01/2025, 16:50
Formation and evolution of circumbinary planets are strongly related to the physics of their native circumbinary discs. Having a comprehensive picture of circumbinary discs is therefore a prerequisite for understanding these processes. Given the sensitivity of the circumbinary disc structure to the detailed disc physics, this requires realistic circumbinary disc modelling. In this talk, we...
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Anna Penzlin15/01/2025, 09:15
"As of today we have about a dozen confirm planets that orbit both binary stars. These planets must have formed and evolved in the protoplanetary, circumbinary disc. To gain a full understanding of the observed planet we need to trace them backwards in time and investigate the planet migration within the disc and how the binary potential can dictate the final orbit of the planets and how the...
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Anna Childs15/01/2025, 09:50
Using a combination of N-body simulations and hydrodynamic models, we explore how terrestrial planets form around binary stars through planetesimal accretion. We consider planet formation around both circular and eccentric binaries and in planetesimal disks that are coplanar, polar, or misaligned to the binary orbital plane. We find that terrestrial planet formation via core accretion around...
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Jerome Orosz15/01/2025, 10:10
It has been almost 15 years since the breakthrough discovery of Kepler-16, which was the first unambiguous detection of a planet orbiting both stars in a binary system with main sequence stars. Thanks largely to the Kepler and TESS missions, around 20 such circumbinary planets have already been detected and some trends seem to have emerged. Unraveling the characteristics of these circumbinary...
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Benjamin Davies15/01/2025, 11:15
The detection of circumbinary planets (CBPs) represents an exciting breakthrough in exoplanetary science. However, the number of known CBPs remains small; out of the several thousand known transiting exoplanets, only 14 are CBPs. This small sample size presents a challenge for studying the formation, evolution, and bulk properties of CBPs. In this contribution, I will present a framework for...
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Dominic Oddo15/01/2025, 11:35
NASA’s Transiting Exoplanet Survey Satellite (TESS) has revolutionized our understanding of nearby low-mass stars, providing a wealth of data for exploring planetary systems in unprecedented detail. We can leverage this excellent dataset to study TESS’s sample of low-mass M+M binaries, which offers interesting cross-sectional science merit from both stellar and planetary perspectives. I am...
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David Martin15/01/2025, 11:55
Planets orbiting single stars transit almost strictly periodically. Yes, there can be some small transit timing variations (TTVs), but these are typically on the order of seconds or minutes. Fundamentally, we find planets around single stars assuming periodic transits, and then characterise any TTVs after the fact. This is not possible for circumbinary planets because geometry and 3-body...
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Amaury Triaud15/01/2025, 14:00
Since 2018 the BEBOP radial velocity survey for circumbinary exoplanet has been monitoring 100 main sequence binaries in both hemispheres. In this talk I will how we have managed to detect circumbinary planets in single as well as double-lined binaries. I will also show preliminary results about a number of other credible candidates. We find that we do not see the same population of planet...
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Nikolaos Georgakarakos15/01/2025, 14:35
In this talk we revisit the problem of the stability of circumbinary planetary orbits and how to identify stable and unstable motion in such cases. In the first part of the talk, we discuss some past results and how the problem has been dealt with so far. We present some stability criteria along with their advantages and disadvantages. In the second part of the talk, we present the latest...
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Gavin Coleman16/01/2025, 10:00
In recent years, free floating planets, i.e. those planets not found to be in a planetary system and with no observable companions, have begun to be found in microlensing and direct imaging surveys. Observations have shown that they have a wide variety of masses, ranging from terrestrial-like to giant planets. Microlensing surveys predict that there could be on order tens of free floating...
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Gabriele Columba16/01/2025, 10:35
Notwithstanding the tremendous growth of the exoplanetary field in the last decade, circumbinary planets (CBPs) remain a small fraction of the total discoveries to date: around fifty CBPs have been identified out of nearly six thousand exoplanets, primarily detected through eclipse timing variations and transits. Almost a third of these orbit post-main-sequence stars, which suggests their...
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Alexander Stephan16/01/2025, 11:40
Observations of evolved stellar binaries over recent years have revealed that stars undergo a mild kick during their evolution into White Dwarfs, most likely caused by a slight asymmetry in their mass loss via stellar winds towards the end of the AGB phase. This kick has a significant impact on the dynamical evolution of stellar binaries and triples, which can cause such systems to separate,...
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Santiago Torres16/01/2025, 12:15
About 15% of solar-type stars are in such close binaries that interaction is bound to occur as the stars evolve and swell. Around 5600 planets have been detected in solar types of stars. However, only about twenty circumbinary planets have been identified. Understanding the intricate dynamics within such complex systems is crucial for unraveling the processes of planet formation and binary...
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Dominik Schleicher16/01/2025, 14:15
Eclipsing time variations in post-common-envelope binaries can be interpreted to be due to the presence of a third body (light-travel time effect) or to be a result of stellar magnetism, leading to the presence of a time-dependent quadrupole moment in the star causing time-dependent variations in the orbit period. In this talk, I will present 3D magneto-hydrodynamical simulations of stellar...
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Beuermann Klaus16/01/2025, 14:50
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Stefan Dreizler16/01/2025, 15:10
The high stellar density in globular clusters produces a variety of intriguing objects resulting from binary interactions, such as blue stragglers, cataclysmic variables, and millisecond pulsars. Binaries play a critical role in the dynamical state of the cluster, as the orbital energy stored in these systems can prevent or delay core collapse. Comparing observed and predicted binary...
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Akke Corporaal16/01/2025, 16:00
Both planets and discs are detected in binary systems beyond the main sequence. In particular, many post-asymptotic giant branch (post-AGB) binary systems are found to host circumbinary discs. These discs, created from the material of the evolved star during some yet poorly understood binary interaction phase, show many similarities with protoplanetary discs around pre-main sequence stars....
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Sebastiano Ledda17/01/2025, 09:30
The evolution of binaries that become double white dwarfs (DWDs) can cause the ejection of high amounts of dust and gas. This material can give rise to circumbinary discs and become the cradle of new planets, yet no studies to date have focused on the formation of circumbinary planets around DWDs. DWDs will be the main sources of gravitational waves detectable by the Laser Interferometer Space...
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Arianna Nigioni17/01/2025, 09:50
The formation and stability of planetary systems around compact binaries, such as double white dwarfs (DWDs), represent a frontier in planetary science, with implications for understanding planet formation in extreme environments. Recent theoretical studies suggest that second-generation planets can form in circumbinary discs around DWDs, potentially evolving into systems hosting sub-Neptunian...
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Thomas Baycroft17/01/2025, 10:10
Gaia data release 4 is around the corner, and it will include the release of all the individual epoch astrometry for the first 5 years of the mission. Predicted to include 10s of thousands of exoplanets, it is less clear exactly what impact the Gaia data will have on circumbinary planet science. I will present up-to-date predictions of the expected yield of circumbinary planets from Gaia and...
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Eamonn Kerins17/01/2025, 11:15
The Nancy Grace Roman Space Telescope (Roman) is a NASA mission that is scheduled to launch in October 2026. Roman will have similar sensitivity and resolution to Hubble but will be able to survey the sky around 1400x faster. Around 25% of the first 5 years of the mission will be devoted to a near-infrared time domain survey of the Galactic bulge that is expected to find around 1,500 cool...
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Hans Deeg17/01/2025, 11:50
An overview over science with circumbinary planets in the context of the PLATO space mission will be given.
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Camilla Danielski (Istituto Nazionale di Astrofisica (INAF))17/01/2025, 14:00
The discovery and study of exoplanets in their diversity is arguably one of the most exciting development in astronomy over the past 25 years, rivalled by the detection of gravitational waves.
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In this talk I will merge these two fields presenting an original observational method which employs gravitational waves to detect exoplanets.
In particular I will show how the Laser Interferometer...
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