Magnetic protection of potentially habitable planets plays a central role in determining their actual habitability and/or the chances of detecting atmospheric biosignatures. We develop here a thermal evolution model of potentially habitable Earth-like planets and super-Earths. Using up-to-date dynamo scaling laws we predict the properties of core dynamo magnetic fields and study the influence of thermal evolution on their properties. The level of magnetic protection of tidally locked and unlocked planets is estimated by combining simplified models of the planetary magnetosphere and a phenomenological description of the stellar wind. Thermal evolution introduces a strong dependence of magnetic protection on planetary mass and rotation rate. Tidally locked terrestrial planets with an Earth-like composition would have early dayside magnetospause distances between 1.5 and 4.0 R p , larger than previously estimated. Unlocked planets with periods of rotation ∼ 1 day are protected by magnetospheres extending between 3 and 8 R p . Our results are robust against variations in planetary bulk composition and uncertainties in other critical model parameters. For illustration purposes the thermal evolution and magnetic protection of the potentially habitable super-Earths GL 581d, GJ 667Cc and HD 40307g were also studied. Assuming an Earth-like composition we found that the dynamos of these planets are already extinct or close to being shut down. While GL 581d is the best protected, the protection of HD 40307g cannot be reliably estimated. GJ 667Cc, even under optimistic conditions, seems to be severely exposed to the stellar wind and, under the conditions of our model, has probably suffered massive atmospheric losses.

Planetary magnetic fields could impact the evolution of planetary atmospheres and have a role in the determination of the required conditions for the emergence and evolution of life (planetary habitability). We study here the role of rotation in the evolution of dynamo-generated magnetic fields in massive Earthlike planets, Super Earths (1-10 M ⊕ ). Using the most recent thermal evolution models of Super Earths (Gaidos et al., 2010;Tachinami et al., 2011) and updated scaling laws for convection-driven dynamos, we predict the evolution of the local Rossby number. This quantity is one of the proxies for core magnetic field regime, i.e. non-reversing dipolar, reversing dipolar and multipolar. We study the dependence of the local Rossby number and hence the core magnetic field regime on planetary mass and rotation rate. Previous works have focused only on the evolution of core magnetic fields assuming rapidly rotating planets, i.e. planets in the dipolar regime. In this work we go further, including the effects of rotation in the evolution of planetary magnetic field regime and obtaining global constraints to the existence of intense protective magnetic fields in rapidly and slowly rotating Super Earths. We find that the emergence and continued existence of a protective planetary magnetic field is not only a function of planetary mass but also depend on rotation rate. Low-mass Super Earths (M 2 M ⊕ ) develop intense surface magnetic fields but their lifetimes will be limited to 2-4 Gyrs for rotational periods larger than 1-4 days. On the other hand and also in the case of slowly rotating planets, more massive Super Earths (M 2 M ⊕ ) have weak magnetic fields but their dipoles will last longer. Finally we analyze tidally locked Super Earths inside and outside the habitable zone of GKM stars. Using the results obtained here we develop a classification of Super Earths based on the rotation rate and according to the evolving properties of dynamo-generated planetary magnetic fields.

Background: The COVID-19 pandemic has highlighted health care systems' vulnerabilities. Hospitals face increasing risk of periods of scarcity of life-sustaining resources such as ventilators for mechanical respiratory support, as has been the case in Italy as of March, 2020. The National Academy of Medicine has provided guidance on crisis standards of care, which call for the reallocation of scarce medical resources to those who will benefit most during extreme situations. Given that this will require a departure from the usual fiduciary duty of the bedside clinician, we determined and mapped potential barriers to the implementation of the guidelines from stakeholders using an implementation science framework. Methods: A protocol was created to operationalize national and state guidelines for triaging ventilators during crisis conditions. Focus groups and key informant interviews were conducted from July-September 2018 with clinicians at three acute care hospitals of an urban academic medical center. Respiratory therapists, intensivists, nursing leadership and the palliative care interdisciplinary team participated in focus groups. Key informant interviews were conducted with emergency management, respiratory therapy and emergency medicine. Subjects were presented the protocol and their reflections were elicited using a semi-structured interview guide. Data from transcripts and notes were categorized using a coding strategy based on the Theoretical Domains Framework. Results: Participants anticipated that implementing this protocol would challenge their roles and identities as clinicians including both their fiduciary duty to the patient and their decision-making autonomy. Despite this, many participants acknowledged the need for such a protocol to standardize care and minimize bias as well as to mitigate potential consequences for individual clinicians. Participants identified the question of considering patient quality of life in triage decisions as an important and unresolved ethical issue in disaster triage. Conclusion: Clinicians' discomfort with shifting roles and obligations could pose implementation barriers for crisis standards of care.

This Arxiv.org version of the manuscript, contains new material not in the printed version of the paper: a) a crust thickness calculation for two α values, and b) inclusion of comet C/2012 T1 Panstarrs, bringuing the total number of members of the ABC group to 12. Number of Tables 5dormant and extinct rocky comets, that turn on (are rejuvenated), in response to a diminution of their perihelion distance.

Objective: To model performance of sequential organ failure assessment (SOFA) score-based ventilator allocation guidelines during the COVID-19 pandemic. Methods: A retrospective cohort study design was used. Study sites included three New York City hospitals in a single academic medical center. We included a random sample (205) of adult patients intubated (1002) from 3/25/20-4/29/20. Protocol criteria adapted from New York State’s 2015 guidelines were applied to determine which patients would have had mechanical ventilation withheld or withdrawn. Results: 117 (57%) patients would have been identified for ventilator withdrawal or withholding, based on the triage guidelines. Of those 117 patients, 28 (24%) survived hospitalization. Overall, 65 (32%) patients survived to discharge. Conclusions: Triage protocols aim to maximize survival by redirecting ventilators to those most likely to survive. Over half of this sample would have been identified as candidates for ventilator exclusion. Clinical judgment would therefore still be needed in ventilator reallocation, re-introducing bias and moral distress. These data suggest limited utility for SOFA score-based ventilator rationing. This raises the question of whether there is sufficient ethical justification to impose a life-ending decision based on a SOFA scoring method on some patients to offer potential benefit to a modest number of others.