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Magnetic Origins of the Stellar Mass-obliquity Correlation in Planetary Systems
| Content Provider | Semantic Scholar |
|---|---|
| Author | Spalding, Christopher Batygin, Konstantin |
| Copyright Year | 2015 |
| Abstract | Detailed observational characterization of transiting exoplanet systems has revealed that the spinaxes of massive (M & 1.2 M ) stars often exhibit substantial misalignments with respect to the orbits of the planets they host. Conversely, lower-mass stars tend to only have limited obliquities. A similar trend has recently emerged within the observational dataset of young stars’ magnetic field strengths: massive T-Tauri stars tend to have dipole fields that are ∼10 times weaker than their less-massive counterparts. Here we show that the associated dependence of magnetic star-disk torques upon stellar mass naturally explains the observed spin-orbit misalignment trend, provided that misalignments are obtained within the disk-hosting phase. Magnetic torques act to realign the stellar spin-axes of lower-mass stars with the disk plane on a timescale significantly shorter than the typical disk lifetime, whereas the same effect operates on a much longer timescale for massive stars. Cumulatively, our results point to a primordial excitation of extrasolar spin-orbit misalignment, signalling consistency with disk-driven migration as the dominant transport mechanism for short-period planets. Furthermore, we predict that spin-orbit misalignments in systems where close-in planets show signatures of dynamical, post-nebular emplacement will not follow the observed correlation with stellar mass. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://authors.library.caltech.edu/62265/2/1508.02365v1.pdf |
| Alternate Webpage(s) | http://authors.library.caltech.edu/62265/1/Spalding_2015p82.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Antivirus software Dynamical system Excitation GUCY2C protein, human Magnetic Fields National origin Ocular orbit Planetary scanner Silo (dataset) Stars, Celestial Stellar (payment network) Stellar classification |
| Content Type | Text |
| Resource Type | Article |
